10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2016

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 000-20540

ON ASSIGNMENT, INC.

(Exact name of registrant as specified in its charter)

Delaware	95-4023433
(State of Incorporation)	(I.R.S. Employer Identification No.)
26745 Malibu Hills Road, Calabasas, CA	91301
(Address of principal executive offices)	(Zip Code)

(818) 878-7900

(Registrant's telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. xYes o No 

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  xYes o No 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

o Yes x No 

At May 5, 2016, the total number of outstanding shares of the Company’s Common Stock ($0.01 par value) was 53,380,314.

1

ON ASSIGNMENT, INC. AND SUBSIDIARIES INDEX
PART I – FINANCIAL INFORMATION
Item 1 – Condensed Consolidated Financial Statements (unaudited)	3
Condensed Consolidated Balance Sheets as of March 31, 2016 and December 31, 2015	3
Condensed Consolidated Statements of Operations and Comprehensive Income for the Three Months Ended March 31, 2016 and 2015	4
Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2016 and 2015	5
Notes to Condensed Consolidated Financial Statements	6
Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations	14
Item 3 – Quantitative and Qualitative Disclosures about Market Risks	19
Item 4 – Controls and Procedures	20
PART II – OTHER INFORMATION
Item 1 – Legal Proceedings	21
Item 1A - Risk Factors	21
Item 6 – Exhibits	22
Signature	23

2

PART I - FINANCIAL INFORMATION

Item 1 — Condensed Consolidated Financial Statements (Unaudited)

ON ASSIGNMENT, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(Dollars in thousands, except share amounts)

	March 31, 2016			December 31,  2015
ASSETS
Current assets:
Cash and cash equivalents	$	28,369		$	23,869
Accounts receivable, net of allowance of $7,284 and $6,682, respectively	378,087			354,808
Prepaid expenses and income taxes	8,849			12,686
Workers' compensation receivable	13,278			13,238
Other current assets	3,585			9,607
Total current assets	432,168			414,208
Property and equipment, net	54,481			53,196
Goodwill	875,657			874,906
Identifiable intangible assets, net	408,099			417,925
Other non-current assets	6,650			7,072
Total assets	$	1,777,055		$	1,767,307
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	6,164		$	9,132
Accrued payroll and contract professional pay	110,886			88,100
Workers’ compensation loss reserves	14,910			15,020
Income taxes payable	3,157			673
Other current liabilities	40,637			47,425
Total current liabilities	175,754			160,350
Long-term debt	723,219			755,508
Deferred income tax liabilities	61,612			61,539
Other long-term liabilities	5,033			5,116
Total liabilities	965,618			982,513
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.01 par value, 1,000,000 shares authorized, no shares issued	—			—
Common stock, $0.01 par value, 75,000,000 shares authorized, 53,344,395 and 53,024,972 issued and outstanding, respectively	533			530
Paid-in capital	550,755			542,859
Retained earnings	266,968			249,567
Accumulated other comprehensive loss	(6,819		)	(8,162		)
Total stockholders’ equity	811,437			784,794
Total liabilities and stockholders’ equity	$	1,777,055		$	1,767,307

See notes to condensed consolidated financial statements.

3

ON ASSIGNMENT, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (UNAUDITED)

(In thousands, except per share amounts)

	Three Months Ended
	March 31,
	2016			2015
Revenues	$	582,040		$	430,045
Costs of services	394,258			294,170
Gross profit	187,782			135,875
Selling, general and administrative expenses	139,881			105,935
Amortization of intangible assets	10,144			4,869
Operating income	37,757			25,071
Interest expense, net	(9,025		)	(3,067		)
Income before income taxes	28,732			22,004
Provision for income taxes	11,384			8,981
Income from continuing operations	17,348			13,023
Gain on sale of discontinued operations, net of income taxes	—			25,703
Income from discontinued operations, net of income taxes	53			409
Net income	$	17,401		$	39,135
Basic earnings per common share:
Continuing operations	$	0.33		$	0.25
Discontinued operations	—			0.51
Net income	$	0.33		$	0.76
Diluted earnings per common share:
Continuing operations	$	0.32		$	0.25
Discontinued operations	—			0.50
Net income	$	0.32		$	0.75
Number of shares and share equivalents used to calculate earnings per share:
Basic	53,147			51,519
Diluted	53,644			52,209
Reconciliation of net income to comprehensive income:
Net income	$	17,401		$	39,135
Changes in fair value of derivative, net of tax	—			47
Foreign currency translation adjustment	1,343			(3,724		)
Comprehensive income	$	18,744		$	35,458

 See notes to condensed consolidated financial statements.

4

ON ASSIGNMENT, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

(In thousands)

	Three Months Ended
	March 31,
	2016			2015
Cash Flows from Operating Activities:
Net income	$	17,401		$	39,135
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of discontinued operations, net of income taxes	—			(25,703		)
Depreciation and amortization	15,427			8,665
Stock-based compensation	6,924			3,954
Gross excess tax benefits from stock-based compensation	(914		)	(1,643		)
Workers’ compensation provision	549			586
Other	4,308			1,930
Changes in operating assets and liabilities:
Accounts receivable	(25,362		)	(14,584		)
Prepaid expenses and income taxes	3,847			7,954
Accounts payable	(2,290		)	205
Accrued payroll and contract professional pay	22,640			3,160
Income taxes payable	3,067			(539		)
Workers’ compensation loss reserves	(699		)	(309		)
Other	(7,584		)	(2,868		)
Net cash provided by operating activities	37,314			19,943
Cash Flows from Investing Activities:
Cash paid for property and equipment	(7,282		)	(8,000		)
Cash received from sale of discontinued operations, net	6,000			114,884
Other	176			12
Net cash provided by (used in) investing activities	(1,106		)	106,896
Cash Flows from Financing Activities:
Principal payments of long-term debt	(33,000		)	(80,563		)
Proceeds from option exercises and employee stock purchase plan	4,023			3,555
Payment of employment taxes related to release of restricted stock awards	(3,590		)	(3,991		)
Gross excess tax benefits from stock-based compensation	914			1,643
Repurchase of common stock	—			(1,645		)
Debt issuance or amendment costs	—			(486		)
Net cash used in financing activities	(31,653		)	(81,487		)
Effect of exchange rate changes on cash and cash equivalents	(55)			(703)
Net Increase in Cash and Cash Equivalents	4,500			44,649
Cash and Cash Equivalents at Beginning of Year (1)	23,869			31,714
Cash and Cash Equivalents at End of Period	$	28,369		$	76,363

⁽¹⁾  Cash and cash equivalents at December 31, 2014 include $2.9 million from the Physician Segment, which was sold on February 1, 2015 (see "Note 4. Discontinued Operations").

Supplemental Disclosure of Cash Flow Information
Cash paid for:
Income taxes	$	3,926	$	1,142
Interest	$	7,261	$	2,695
Supplemental Disclosure of Non-Cash Transactions
Acquisition of property and equipment through accounts payable	$	287	$	1,011

See notes to condensed consolidated financial statements.

5

ON ASSIGNMENT, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. Financial Statement Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the rules of the Securities and Exchange Commission (the "SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations. The December 31, 2015 condensed consolidated balance sheet was derived from audited financial statements. The financial statements include adjustments consisting of normal recurring items, which, in the opinion of management, are necessary for a fair presentation of the financial position of On Assignment, Inc. and its subsidiaries (the "Company") and its results of operations for the interim dates and periods set forth herein. The results for any of the interim periods are not necessarily indicative of the results to be expected for the full year or any other period. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 ("2015 10-K").

2. Accounting Standards Update

In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40). ASU No. 2015-05 provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. It is effective for annual periods (including interim periods) beginning after December 15, 2015, and early adoption is permitted. The Company prospectively adopted ASU 2015-05 as of January 1, 2016, with no impact to its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which is intended to improve financial reporting about leasing transactions. This standard requires a lessee to record on the balance sheet the assets and liabilities for the rights and obligations created by lease terms of more than 12 months. It is effective for annual periods (including interim periods) beginning after December 15, 2018, and early adoption is permitted. The Company is currently evaluating the impact the provisions of ASU 2016-02 will have on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718), which is intended to simplify the accounting for the taxes related to stock-based compensation, including adjustments to how excess tax benefits and a company's payments for tax withholdings should be classified. It is effective for annual periods (including interim periods) beginning after December 15, 2016, and early adoption is permitted. The Company is currently evaluating the impact the provisions of ASU 2016-09 will have on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606)-Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606)-Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. These standards, pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date (Topic 606) issued by the FASB in August 2015, will be effective for annual periods (including interim periods) beginning after December 15, 2017. The Company is currently evaluating the impact these provisions will have on its consolidated financial statements.

3. Acquisitions

On June 5, 2015, the Company acquired all of the outstanding shares of the holding company for Creative Circle, LLC ("Creative Circle"). Creative Circle, which is headquartered in Los Angeles, California, was purchased to expand the Company’s technical and creative staffing services. The purchase price consisted of $540.0 million cash, $30.2 million of common stock (794,700 shares of the Company’s common stock), and estimated future contingent consideration which was valued at $13.8 million. Goodwill related to this acquisition totaled $358.0 million, and is deductible for income tax purposes. Acquisition expenses of approximately $5.7 million were expensed in 2015 and are included in selling, general and administrative expenses ("SG&A"). The results of operations for the acquisition have been combined with those of the Company from the acquisition date.

On April 14, 2015, the Company acquired all of the outstanding shares of LabResource B.V. ("LabResource") headquartered in Amsterdam, Netherlands for $12.7 million. LabResource was purchased to expand the Company's life sciences staffing business in Europe. Goodwill associated with this acquisition is not deductible for tax purposes. Acquisition expenses of approximately $0.4 million were expensed in 2015 and are included in SG&A. The results of operations for this acquisition have been combined with those of the Company from the acquisition date.

Assets and liabilities of the acquired companies were recorded at their estimated fair values at the dates of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill. The fair value assigned to identifiable intangible assets was determined primarily by using a discounted cash flow method. The Company's allocation of the purchase price of Creative Circle and LabResource has been finalized and the following table summarizes the allocations (in thousands):

6

	Creative Circle		LabResource
Cash	$	4,840	$	187
Accounts receivable	34,386		1,643
Prepaid expenses and other current assets	4,462		—
Property and equipment	5,077		12
Goodwill	358,029		6,449
Identifiable intangible assets	194,500		7,528
Other	651		—
Total assets acquired	$	601,945	$	15,819
Current liabilities	$	12,254	$	1,482
Other	—		1,882
Total liabilities assumed	12,254		3,364
Total purchase price (1) (2)	$	589,691	$	12,455

(1) Excluding cash acquired and a $0.9 million adjustment for net working capital in excess of the targeted amount (thereby increasing the actual purchase price paid), the purchase price for Creative Circle was $584.0 million as described in the discussion above.

(2) Excluding cash acquired and a $0.4 million adjustment for net working capital that was less than the targeted amount (thereby reducing the actual purchase price paid), the purchase price for LabResource was $12.7 million as described in the discussion above.

The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions:

		Identifiable Intangible Asset Value
	Useful life	Creative Circle		LabResource
Contractor relationships	2 - 4 years	$	29,500	$	947
Customer relationships	2 - 10 years	90,700		5,421
Non-compete agreements	2 - 6 years	7,300		20
Favorable contracts	5 years	900		—
Trademarks	indefinite	66,100		1,140
Total identifiable intangible assets acquired		$	194,500	$	7,528

The summary below (in thousands, except for per share data) presents pro forma unaudited consolidated results of operations for the three months ended March 31, 2015 as if the acquisitions of Creative Circle and LabResource occurred on January 1, 2014. The pro forma financial information gives effect to certain adjustments, including amortization of intangible assets, interest expense on acquisition-related debt, provision for income taxes, and increased number of common shares as a result of the acquisitions. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition. The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisitions had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.

7

Revenues	$	494,708
Income from continuing operations	$	13,955
Net income	$	40,067
Basic earnings per share:
Income from continuing operations	$	0.27
Net income	$	0.77
Diluted earnings per share:
Income from continuing operations	$	0.26
Net income	$	0.76
Number of shares and share equivalents used to calculate earnings per share:
Basic	52,314
Diluted	53,046

4. Discontinued Operations

On February 1, 2015, the Company completed the sale of its Physician Segment for $123.0 million including $6.0 million that was held in escrow and was released in March 2016. The gain on the sale was $25.7 million (net of income taxes of $14.4 million). The operating results of this segment are presented as discontinued operations in the condensed consolidated statements of operations and comprehensive income for all periods presented.

Cash flows from discontinued operations are included in the condensed consolidated statements of cash flows for the three months ended March 31, 2016 and 2015. The cash flows that are attributable to the Physician Segment are as follows (in thousands):

	Three Months Ended
	March 31,
	2016		2015
Net cash provided by (used in) operating activities	$	53	$	(1,778	)
Net cash provided by investing activities:
Cash received from sale of discontinued operations, net	$	6,000	$	114,884
Other	—		(14		)
Total cash provided by investing activities	$	6,000	$	114,870

The following is a summary of the operating results of all of the Company's discontinued operations (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Revenues	$	—		$	12,068
Costs of services	—			8,653
Gross profit	—			3,415
Selling, general and administrative expenses	(85		)	2,641
Amortization of intangible assets	—			155
Income before income taxes	85			619
Provision for income taxes	32			210
Income from discontinued operations, net of income taxes	$	53		$	409

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5. Goodwill and Identifiable Intangible Assets

The changes in the carrying amount of goodwill for the year ended December 31, 2015 and the three months endedMarch 31, 2016 are as follows (in thousands):

	Apex Segment			Oxford Segment			Total
Balance as of December 31, 2014	$	287,951		$	224,109		$	512,060
Creative Circle Acquisition	358,029			—			358,029
LabResource Acquisition	—			6,449			6,449
Translation adjustment	(1,363		)	(269		)	(1,632		)
Balance as of December 31, 2015	644,617			230,289			874,906
Translation adjustment	355			396			751
Balance as of March 31, 2016	$	644,972		$	230,685		$	875,657

Acquired intangible assets consisted of the following (in thousands):

		As of March 31, 2016						As of December 31, 2015
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Subject to amortization:
Customer relationships	2 - 10 years	$	196,780	$	80,781	$	115,999	$	196,472	$	74,640	$	121,832
Contractor relationships	2 - 5 years	69,813		42,991		26,822		69,764		40,124		29,640
Non-compete agreements	2 - 7 years	10,889		3,626		7,263		10,874		3,163		7,711
In-use software	6 years	18,900		7,304		11,596		18,900		6,516		12,384
Favorable contracts	5 years	900		242		658		900		172		728
		297,282		134,944		162,338		296,910		124,615		172,295
Not subject to amortization:
Trademarks		245,761		—		245,761		245,630		—		245,630
Total		$	543,043	$	134,944	$	408,099	$	542,540	$	124,615	$	417,925

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Amortization expense for intangible assets with finite lives was $10.1 million and $4.9 million for the three months ended March 31, 2016 and 2015, respectively. Estimated amortization expense for the remainder of this year, each of the next four years, and thereafter is as follows (in thousands): 

2016	$	29,515
2017	33,054
2018	28,928
2019	22,016
2020	14,515
Thereafter	34,310
	$	162,338

Goodwill and other intangible assets having an indefinite useful life are not amortized for financial statement purposes. These assets are reviewed for impairment on an annual basis as of October 31 and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. There were no triggering events that required an interim impairment analysis during the current period.

6. Long-Term Debt

Long-term debt consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
$150 million revolving credit facility, due June 2020	$	34,000		$	50,000
$825 million Term B loan facility, due June 2022	707,000			724,000
	741,000			774,000
Unamortized deferred loan costs	(17,781		)	(18,492		)
	$	723,219		$	755,508

On June 5, 2015, the Company entered into a new $975.0 million credit facility. The funds were used to repay the old credit facility and to fund the cash portion of the purchase of Creative Circle (see "Note 3. Acquisitions"). The new facility consists of (i) an $825.0 million seven-year term B loan facility and (ii) a $150.0 million five-year revolving loan facility. Under terms of the new facility, the Company has the ability to increase the principal amount of the loan facilities.

Borrowings under the term B loan bear interest at LIBOR (floor of 75 basis points), plus 3.0 percent and borrowings under the revolving credit facility bear interest at LIBOR (or the bank’s base rate) plus 0.75 to 2.5 percent depending on leverage levels. A commitment fee of 0.25 to 0.40 percent is payable on the undrawn portion of the revolving credit facility. At March 31, 2016, the weighted average interest rate was 3.7 percent.

Under terms of the credit facility, the Company was required to make minimum quarterly payments of $2.1 million. Through March 31, 2016, the Company repaid $134.0 million, and as a result, the next required payments will be on the maturity dates. The Company is also required to make mandatory prepayments, subject to specified exceptions, from excess cash flow and with the proceeds of asset sales, debt issuances and specified other events.

The Company's obligations under the credit facility are guaranteed by substantially all of its direct and indirect domestic subsidiaries and are secured by a lien on substantially all of the Company's tangible and intangible property and by a pledge of all of the equity interests in its direct and indirect domestic subsidiaries.

The credit facility includes various restrictive covenants including the maximum ratio of consolidated funded debt to consolidated EBITDA (4.25 to 1.00 as of March 31, 2016 decreasing to 3.25 to 1.00 on March 31, 2018). The credit facility also contains certain customary limitations including, among other terms and conditions, the Company's ability to incur additional indebtedness, engage in mergers and acquisitions, and declare dividends. At March 31, 2016 the Company had a ratio of consolidated funded debt to consolidated EBITDA of 2.80 to 1.00.

At March 31, 2016 the Company was in compliance with all of its debt covenants and had $112.5 million of borrowing available under the revolving credit facility.

7. Commitments and Contingencies

The Company has entered into various non-cancelable operating leases, primarily related to its facilities and certain office equipment used in the ordinary course of business. The Company leases two properties owned by related parties. Rent expense for these two properties was$0.3 millionfor thethree months ended March 31, 2016and2015.

The Company carries large retention policies for its workers’ compensation liability exposures. The workers' compensation loss reserves are based upon an actuarial report obtained from a third party and determined based on claims filed and claims incurred but not reported. The Company accounts for claims incurred but not yet reported based on estimates derived from historical claims experience and current trends of industry data. Changes in estimates, differences in estimates, and actual payments for claims, are recognized in the period that the estimates

10

changed or the payments were made. The workers' compensation loss reserves were approximately $1.6 million and $1.8 million, net of anticipated insurance and indemnification recoveries of $13.3 million and $13.2 million, at March 31, 2016 and December 31, 2015, respectively. The Company has unused stand-by letters of credit outstanding to secure obligations for workers’ compensation claims with various insurance carriers. The unused stand-by letters of credit at March 31, 2016 and December 31, 2015 were $3.5 million.

The Company is subject to contingent consideration agreements entered into in connection with certain of its acquisitions. If the acquired businessesmeet predetermined targets, the Company is obligated to make additional cash payments in accordance with the terms ofsuch contingent consideration agreements, see note "8. Fair Value Measurements."

Certain employees participate in the Company’s Change in Control Severance Plan, or have separate agreements that provide for certain benefits in the event of termination at the Company's convenience or following a change in control, as defined by the plan or agreement. Generally, these benefits are based on the employee’s length of service and position with the Company and include, severance, continuation of health insurance and in certain cases acceleration of vesting of option or stock awards.

Legal Proceedings

The Company is involved in various legal proceedings, claims and litigation arising in the ordinary course of business. Based on the facts currently available, the Company does not believe that the disposition of matters that are pending or asserted will have a material effect on its consolidated financial statements.

8. Fair Value Measurements

The recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value based on their short-term nature. Long-term debt recorded in the Company’s condensed consolidated balance sheet atMarch 31, 2016was$723.2 million (net of $17.8 million of unamortized deferred loan costs, see "Note 6. Long-Term Debt"). The fair value of the long-term debt at that same date was$744.5 million as determined using the quoted price technique, based on Level 2 inputs (significant observable inputs other than quoted prices for identical assets in active markets) from the fair value hierarchy, and included the yields of comparable companies with similar credit characteristics.

Related to its acquisitions, atMarch 31, 2016, the Company had obligations to pay contingent consideration in cash if certain performance targets were met. The fair value of this contingent consideration was determined using an expected present value technique. Expected cash flows were determined using the probability-weighted average of possible outcomes that would occur should certain financial metrics be reached. There is no market data available to use in valuing the contingent consideration, therefore, the Company developed its own assumptions related to the future financial performance of the businesses to evaluate the fair value of these liabilities. As such, the contingent consideration is classified within Level 3 inputs (unobservable inputs) from the fair value hierarchy.The fair value of the liability for contingent consideration is established at the time of the acquisition and finalized by the end of the measurement period. Its fair value is thenremeasured on a recurring basis with changes due to the accretion of the present value discount, recorded in interest expense and changes related to new developments in expected performance, recorded in SG&A. At March 31, 2016, the contingent consideration was determined to be$21.6 millionand is included in other current liabilities. The Company expects to make the contingent consideration payments within the next three months. At December 31, 2015, contingent consideration was $21.0 million and was included in other current liabilities. The performance period for these contingent consideration arrangements ended on December 31, 2015.

The following table summarizes the balance of the contingent consideration and changes for the periods presented (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Balance at beginning of period	$	(20,981	)	$	(3,000	)
Additions for acquisitions	—			—
Payments on contingent consideration	—			—
Fair value adjustment	(613		)	—
Foreign currency translation adjustment	—			—
Balance at end of period	$	(21,594	)	$	(3,000	)

Certain assets and liabilities, such as goodwill, are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (e.g., when there is evidence of impairment). For the three months endedMarch 31, 2016and 2015, no fair value adjustments were required for non-financial assets or liabilities.

9. Accumulated Other Comprehensive Loss

The accumulated other comprehensive loss balance at March 31, 2016 and December 31, 2015, and the activity during the three months endedMarch 31, 2016, consists of foreign currency translation adjustments.

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10. Stock-based Compensation

On March 31, 2016, the Company issued 128,518 shares of common stock under its Employee Stock Purchase Plan, as amended (the "ESPP").

Stock-based compensation expense, including the ESPP, was $6.9 million and $4.0 million for the three months endedMarch 31, 2016 and 2015, respectively, which was included in SG&A expense.

11. Earnings Per Share

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2016	2015
Weighted average number of common shares outstanding used to compute basic earnings per share	53,147	51,519
Dilutive effect of stock-based awards	497	690
Number of shares used to compute diluted earnings per share	53,644	52,209

There were 473,000 share equivalents outstanding during the three months ended March 31, 2016 that were excluded from the computation of diluted earnings per share because the exercise price for these options was greater than the average market price of the Company’s shares of common stock and became anti-dilutive when applying the treasury stock method. During the three months ended March 31, 2015 there were no significant share equivalents outstanding that were excluded from the computation of diluted earnings per share because they became anti-dilutive when applying the treasury stock method.

12. Income Taxes

For interim reporting periods, the Company estimates its full-year income and the related income tax expense for each jurisdiction in which the Company operates. Changes in the geographical mix, permanent differences or estimated level of annual pre-tax income can impact the Company’s actual effective rate.

13. Segment Reporting

On Assignment provides services through two operating segments, the Apex Segment and the Oxford Segment, with each addressing different sectors of the professional staffing market with distinct business models attuned to those sectors. Businesses in the Apex Segment predominately serve markets with a large and local talent pool, and provide a full range of skills through a network of local offices where clients most value relationship, speed, reliability and price. The Apex Segment provides a broad spectrum of technical, scientific and creative professionals for contract, contract-to-hire and permanent placement positions to Fortune 1000 and mid-market clients across the United States. Our businesses in this segment include Apex Systems, Lab Support and Creative Circle. Businesses in the Oxford Segment predominately serve markets with higher-end, specialized skills through a combination of national recruiting centers and local offices where clients most value the unique skill of the candidate and speed of response. The Oxford Segment provides specialized, niche staffing and consulting services in select skill and geographic markets. Our businesses in this segment include Oxford, CyberCoders and Life Sciences Europe.

Effective January 1, 2016, there were two changes to the Company's segment configuration: 1) the Apex Segment now includes a small clinical research business which was previously included in the Oxford Segment, and 2) costs associated with personnel located at our Corporate office that have shared services roles and support certain of our businesses, primarily within the Oxford Segment, are now presented in the segments they support whereas previously they were presented within Corporate. For comparability purposes, prior periods have been adjusted to reflect these changes.

The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit and operating income. The information in the following tables is derived directly from the segments’ internal financial reporting used for corporate management purposes. The Company's management does not evaluate, manage or measure performance of segments using asset information, and such information is not readily available. Accordingly, assets by reportable segment are not disclosed.

The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):

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	Three Months Ended
	March 31, 2016
	Apex		Oxford		Corporate(1)			Total
Revenues	$	433,155	$	148,885	$	—		$	582,040
Gross profit	126,144		61,638		—			187,782
Operating income	39,986		12,760		(14,989		)	37,757
Amortization	8,590		1,554		—			10,144

	Three Months Ended
	March 31, 2015
	Apex		Oxford (2)		Corporate(1)			Total
Revenues	$	295,971	$	134,074	$	—		$	430,045
Gross profit	80,152		55,723		—			135,875
Operating income	22,896		12,713		(10,538		)	25,071
Amortization	3,522		1,347		—			4,869

(1) Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses, and depreciation expense for corporate assets.

(2) During the quarter ended June 30, 2015, due to management changes, the Company realigned its former Life Sciences Europe Segment to be included in the Oxford Segment. Prior periods have been adjusted to reflect this change.

The following table presents revenues by type (in thousands):

	Three Months Ended
	March 31,
	2016		%		2015		%
Revenues:
Assignment	$	549,552	94.4	%	$	406,141	94.4	%
Permanent placement	32,488		5.6	%	23,904		5.6	%
	$	582,040	100.0	%	$	430,045	100.0	%

The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table presents revenues by geographic location (in thousands):

	Three Months Ended
	March 31,
	2016		%		2015		%
Revenues:
Domestic	$	554,438	95.3	%	$	410,756	95.5	%
Foreign	27,602		4.7	%	19,289		4.5	%
	$	582,040	100.0	%	$	430,045	100.0	%

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Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations

The information in this discussion contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Such statements are based upon current expectations that involve risks and uncertainties. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements or opinions. For example, the words “believes,” “anticipates,” “plans,” “expects,” “intends,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements include statements regarding our anticipated financial and operating performance for future periods. Our actual results could differ materially from those discussed herein. Factors that could cause or contribute to such differences include, but are not limited to, the following: (1) actual demand for our services; (2) the general political and economic environment; (3) our ability to attract, train and retain qualified staffing consultants; (4) our ability to remain competitive in obtaining and retaining staffing clients; (5) the availability of qualified contract professionals; (6) our ability to manage our growth efficiently and effectively; (7) continued performance and improvement of our enterprise-wide information systems; (8) our ability to manage potential or actual litigation matters; (9) the successful integration of our recently acquired subsidiaries; (10) the successful implementation of our five-year strategic plan; and (11) other risks detailed from time to time in our reports filed with the SEC, including in our 2015 10-K under the section “Risk Factors.” Other factors also may contribute to the differences between our forward-looking statements and our actual results. In addition, as a result of these and other factors, our past financial performance should not be relied on as an indication of future performance. All forward-looking statements in this document are based on information available to us as of the date we file this Quarterly Report on Form 10-Q, and we assume no obligation to update any forward-looking statement or opinion, or the reasons why our actual results may differ.

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OVERVIEW

On Assignment, Inc., is a leading global provider of highly skilled, hard-to-find professionals in the growing technology, life sciences, and creative sectors, where quality people are the key to success. We go beyond matching résumés with job descriptions to match people we know into positions we understand, for contract, contract-to-hire and direct hire assignments.

On Assignment provides services through two operating segments, the Apex Segment and the Oxford Segment, with each addressing different sectors of the professional staffing market with distinct business models attuned to those sectors. Businesses in the Apex Segment predominately serve markets with a large and local talent pool, and provide a full range of skills through a network of local offices where clients most value relationship, speed, reliability and price. The Apex Segment provides a broad spectrum of technical, scientific, and creative professionals for contract, contract-to-hire and permanent placement positions to Fortune 1000 and mid-market clients across the United States. Our businesses in this segment include Apex Systems, Lab Support and Creative Circle. Businesses in the Oxford Segment predominately serve markets with higher-end, specialized skills through a combination of national recruiting centers and local offices where clients most value the unique skill of the candidate and speed of response. The Oxford Segment provides specialized, niche staffing and consulting services in select skill and geographic markets. Our businesses in this segment include Oxford, CyberCoders and Life Sciences Europe.

Results of Operations

CHANGES IN RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 2016

COMPARED WITH THE THREE MONTHS ENDED MARCH 31, 2015

The tables and discussion below include pro forma and constant currency data. Pro forma assumes the acquisitions of Creative Circle and LabResource, which were acquired in the second quarter of 2015 (the "Acquisitions"), occurred at the beginning of 2014. Operating results of Creative Circle are included in the Apex Segment, and the operating results of LabResource are included in the Oxford Segment. Constant currency data (a non-GAAP measure) shown below are on a pro forma basis and were calculated using the foreign exchange rates from the same period in the prior year.

Effective January 1, 2016, there was a change to our segment configuration whereby the Apex Segment now includes a small clinical research business, which was previously included in the Oxford Segment. For comparability purposes, prior periods have been adjusted to reflect these changes. In the tables below, as reported year-over-year growth rates (revenues table) and change (gross profit table), compares current quarter reported results with the quarter ended March 31, 2015, as adjusted for our new segment configuration.

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	Three Months Ended March 31,
	As Reported			As Adjusted			Pro Forma			Year-Over-Year Growth Rates
	2016			2015			2015			As Reported		Pro Forma			Constant Currency
	(Dollars in millions)
Revenues by segment:
Apex:
Assignment	$	422.1		$	291.7		$	348.9		44.7	%		21.0	%		21.0	%
Permanent placement	11.0			4.3			9.5			156.9	%		15.9	%		15.9	%
	433.1			296.0			358.4			46.4	%		20.8	%		20.8	%
Oxford:
Assignment	127.4			114.4			116.6			11.3	%		9.3	%		9.7	%
Permanent placement	21.5			19.6			19.7			9.4	%		9.1	%		9.1	%
	148.9			134.0			136.3			11.0	%		9.3	%		9.6	%
Consolidated:
Assignment	549.5			406.1			465.5			35.3	%		18.1	%		18.2	%
Permanent placement	32.5			23.9			29.2			35.9	%		11.3	%		11.3	%
	$	582.0		$	430.0		$	494.7		35.3	%		17.7	%		17.8	%
Percentage of total revenues:
Apex	74.4		%	68.8		%	72.5		%
Oxford	25.6		%	31.2		%	27.5		%
	100.0		%	100.0		%	100.0		%
Assignment	94.4		%	94.4		%	94.1		%
Permanent placement	5.6		%	5.6		%	5.9		%
	100.0		%	100.0		%	100.0		%
Domestic	95.3		%	95.5		%	95.6		%
Foreign	4.7		%	4.5		%	4.4		%
	100.0		%	100.0		%	100.0		%

Revenues on an as reported basis increased $152.0 million, or 35.3 percent year-over-year as a result of (i) the contribution of $79.3 million in revenues from the Acquisitions and (ii) year-over-year revenue growth of 16.9 percent excluding the contribution from the Acquisitions. On a pro forma basis, revenues were up $87.3 million, or 17.7 percent, year-over-year. Assignment revenues were $549.5 million, up 35.3 percent year-over-year on an as reported basis and 18.1 percent on a pro forma basis. Permanent placement revenues, comprised of direct hire and conversion fees, were $32.5 million, up 35.9 percent year-over-year on an as reported basis and 11.3 percent on pro forma basis. Permanent placement revenues accounted for 5.6 percent of total revenues down from 5.9 percent for the first quarter of last year on a pro forma basis.

The Apex Segment accounted for 74.4 percent of consolidated revenues in the first quarter of 2016, up from 72.5 percent in the same period of last year on a pro forma basis. Its revenues on an as reported basis were $433.1 million, up 46.4 percent year-over-year. This increase was a result of (i) the contribution of $76.3 million in revenues from Creative Circle and (ii) year-over-year revenue growth of 20.6 percent excluding the contribution from Creative Circle. On a pro forma basis, revenues were up 20.8 percent. This resulted mainly from high growth rate of Apex Systems (which accounted for 73.6 percent of the segment's revenues and had a year-over-year revenue growth rate of 21.5 percent), and continued high growth from Creative Circle. The revenue growth of Apex Systems reflected, among other things, higher demand in our end markets and improved productivity from our sales consultants.

The Oxford Segment accounted for 25.6 percent of consolidated revenues in the first quarter of 2016. Its revenues on an as reported basis were $148.9 million, up 11.0 percent year-over-year. This increase was the result of (i) year-over year revenue growth of 8.8 percent excluding the contribution from LabResource, and (ii) the contribution of $3.0 million in revenues from LabResource. On a pro forma basis, revenues were up 9.3 percent.

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Gross Profit and Gross Margins

	Three Months Ended March 31,
	As Reported			As Adjusted			Pro Forma			Year-Over-Year Change
	2016			2015			2015			As Reported		Pro Forma
	(Dollars in millions)
Gross profit:
Apex	$	126.2		$	80.2		$	106.6		57.4	%	18.3	%
Oxford	61.6			55.7			56.5			10.6	%	9.1	%
Consolidated	$	187.8		$	135.9		$	163.1		38.2	%	15.1	%
Gross margin(1):
Apex	29.1		%	27.1		%	29.7		%	2.0	%	(0.6	)%
Oxford	41.4		%	41.6		%	41.5		%	(0.2	)%	(0.1	)%
Consolidated	32.3		%	31.6		%	33.0		%	0.7	%	(0.7	)%

(1) The year-over-year change in gross margin is the percentage point differential.

Gross profit is comprised of revenues less costs of services which consist primarily of compensation for our contract professionals and assignment related expenses. Gross profit for the current quarter was $187.8 million, up 38.2 percent year-over-year. Gross margin was 32.3 percent, an expansion of 70 basis points year-over-year on an as reported basis. This expansion related to the inclusion of Creative Circle, which has a higher assignment gross margin than our other divisions. On a pro forma basis, our consolidated gross margin had a compression of 70 basis points year-over-year, which was primarily revenue mix driven related to the higher growth of Apex Systems relative to our other divisions in the aggregate. While Apex Systems generally has a lower gross margin than our other divisions, it has a higher conversion of gross profit into operating income due to its scale and operating efficiency.

The Apex Segment accounted for 67.2 percent of consolidated gross profit in the current quarter. Its gross profit was $126.2 million, up 57.4 percent, as a result of (i) contribution of $31.8 million from Creative Circle and (ii) year-over-year revenue growth of 20.6 percent excluding the contribution from Creative Circle. Gross margin for the segment was 29.1 percent, an expansion of two percentage points year-over-year on an as reported basis due to (i) the inclusion of Creative Circle, which has a higher assignment gross margin than the other operating units of the Apex Segment, and (ii) a higher mix of permanent placement revenues. On a pro forma basis, gross margin for the segment was approximately 60 basis points lower than the first quarter of 2015. This compression was mix driven related to (i) the high relative growth of Apex Systems, which as mentioned above has a lower gross margin than the other operating units comprising the segment and (ii) higher mix of revenues from Apex Systems top accounts, which carry a lower gross margin than its other accounts.

The Oxford Segment accounted for 32.8 percent of consolidated gross profit in 2016. Its gross profit was $61.6 million, up 10.6 percent year-over-year as a result of (i) year-over-year revenue growth of 8.8 percent excluding the contributions from LabResource, and (ii) contribution of $1.1 million from LabResource. Its gross margin was 41.4 percent, a compression of 20 basis points year-over-year primarily due to changes in business mix.

Selling, General and Administrative Expenses

Selling, general and administrative ("SG&A") expenses consist primarily of compensation for our field operations and corporate staff, rent, information systems, marketing, telecommunications, public company expenses and other general and administrative expenses. SG&A expenses for the quarter were $139.9 million (24.0 percent of revenues), up from $105.9 million (24.6 percent of revenues) in the same period last year. The increase in SG&A expenses was due to (i) $16.6 million from the operations of the Acquisitions, (ii) $1.0 million higher acquisition, integration and strategic planning expenses related to the integration of certain operating units of the Oxford Segment, (iii) $3.0 million higher stock-based compensation expense, (iv) higher incentive bonus accruals as operating performance in the current quarter, which was in line with or above our incentive performance targets (whereas operating performance for the same period last year was generally below our targets), and (v) additional costs related to investments in new practice areas. Excluding (i) acquisition, integration and strategic planning expenses, (ii) stock-based compensation expense and (iii) depreciation expense, SG&A expenses as a percentage of revenues were 21.5 percent in the current quarter, or 1.1 percentage points lower than the same period last year as a result of improved operating efficiency.

Amortization of Intangible Assets

Amortization of intangible assets for the quarter was $10.1 million, compared with $4.9 million in the same period last year. The increase related to amortization from the Acquisitions.

Interest Expense, Net

Interest expense (net of interest income) for the quarter was $9.0 million, compared with $3.1 million in the same period last year. The increase in interest expense was due to higher debt levels related to the acquisition of Creative Circle, which was funded primarily from proceeds from

17

borrowings. Interest expense for the quarter was comprised of (i) interest on the credit facility of $7.2 million, (ii) amortization of deferred loan costs of $0.9 million, and (iii) accretion of discount of $0.9 million on the contingent consideration liability related to acquisitions.

Provision for Income Taxes

The provision for income taxes was $11.4 million for the quarter, compared with $9.0 million in the same period last year. The effective tax rate for the quarter was 39.6 percent, a decrease from the 41.4 percent for the full year 2015. This lower effective tax rate was due a lower mix of non-deductible expenses.

Income from Continuing Operations

Income from continuing operations was $17.3 million for the quarter, compared with $13.0 million in the same period last year.

Discontinued Operations

Income from discontinued operations, net of income taxes was $0.1 million for the quarter, compared with $0.4 million in the same period last year.

Net Income

Net income was $17.4 million for the quarter, compared with $39.1 million in the same period last year.

Liquidity and Capital Resources

Our working capital (current assets less current liabilities) as of March 31, 2016 was $256.4 million and our cash and cash equivalents were $28.4 million, of which $10.3 million was held in foreign countries, which is not available to fund domestic operations unless repatriated. We do not intend to repatriate cash held in foreign countries. Our operating cash flows and borrowings under our credit facilities have been our primary source of liquidity and have been sufficient to fund our working capital and capital expenditure needs. Our working capital requirements are primarily driven by the overall growth in our business and debt service requirements. We believe that our working capital as of March 31, 2016, availability under our revolving credit facility, and expected operating cash flows will be sufficient to meet our obligations, working capital requirements and capital expenditures for the next 12 months.

Net cash provided by operating activities was $37.3 million for the quarter, compared with $19.9 million for the same period last year. Net cash provided by operating activities for the quarter was comprised of net income of $17.4 million and non-cash items of $26.3 million (e.g., depreciation, amortization, stock-based compensation, etc.), reduced by an increase of $6.4 million in net operating assets related to the higher year-over-year growth rate of our business relative to the first quarter of last year. Net cash provided by operating activities in the same period last year was comprised of net income of $39.1 million and non-cash items of $13.5 million, reduced by the $25.7 million gain from the sale of the Physician Segment and $7.0 million change in net operating assets.

Net cash used in investing activities was $1.1 million for the quarter, compared with $106.9 million cash provided by investing activities for the same period last year. Net cash used in investing activities for the quarter was comprised of $6.0 million in proceeds from the sale of our Physician Segment offset by $7.3 million in cash used to purchase property and equipment. Net cash provided by investing activities in the same period last year consisted primarily of $114.9 million net proceeds from the sale of the Physician Segment, partially offset by $8.0 million cash used to purchase property and equipment.

Net cash used in financing activities was $31.7 million for the quarter, compared with $81.5 million for the same period last year. Net cash used in financing activities for the quarter consisted primarily of $33.0 million in principal payments of long-term debt. Net cash used in financing activities in the same period last year consisted primarily of $80.6 million in principal payments of long-term debt.

On June 5, 2015, the Company entered into a new $975.0 million credit facility. The funds were used to repay the old credit facility and to fund the cash portion of the purchase of Creative Circle (see "Note 3. Acquisitions"). This facility consists of (i) an $825.0 million seven-year term B loan facility and (ii) a $150.0 million five-year revolving loan facility. Under terms of the credit facility, we were required to make minimum quarterly payments of $2.1 million. However, through March 31, 2016 we have repaid $134.0 million, and as a result, the next required payments will be on the maturity dates. We are also required to make mandatory prepayments, subject to specified exceptions, from excess cash flow and with the proceeds of asset sales, debt issuances and specified other events. The outstanding balance on the facility at March 31, 2016 was $741.0 million (see "Note 6. Long-Term Debt"). The maximum ratio of consolidated funded debt to consolidated EBITDA steps down at regular intervals from 4.25 to 1.00 as of March 31, 2016, to 3.25 to 1.00 as of March 31, 2018 and thereafter. As of March 31, 2016, the leverage ratio was 2.80 to 1.00. Additionally, the credit facility, which is secured by substantially all of our assets, provides for certain limitations on our ability to, among other things, incur additional debt, offer loans, and declare dividends. As of March 31, 2016, we had $112.5 million of borrowings available under our revolving credit facility.

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Recent Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2016-02, Leases (Topic 842), which is intended to improve financial reporting about leasing transactions. This standard requires a lessee to record on the balance sheet the assets and liabilities for the rights and obligations created by lease terms of more than 12 months. It is effective for annual periods (including interim periods) beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the impact the provisions of ASU 2016-02 will have on our consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718), which simplifies the accounting for the taxes related to stock-based compensation, including adjustments to how excess tax benefits and a company's payments for tax withholdings should be classified. It is effective for annual periods (including interim periods) beginning after December 15, 2016, and early adoption is permitted. We are currently evaluating the impact the provisions of ASU 2016-09 will have on our consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606)-Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606)-Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. These standards, pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date (Topic 606) issued by the FASB in August 2015, will be effective for annual periods (including interim periods) beginning after December 15, 2017. We are currently evaluating the impact these provisions will have on our consolidated financial statements.

Critical Accounting Policies

There have been no significant changes to our critical accounting policies and estimates during thethree months endedMarch 31, 2016compared with those disclosed in Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations of our201510-K.

Commitments

In connection with certain acquisitions, we are subject to contingent consideration agreements. If the acquired businesses meet predetermined targets, we are obligated to make additional cash payments in accordance with the terms of such contingent consideration agreements. As of March 31, 2016, the contingent consideration was determined to be$21.6 million. The performance period for these contingent consideration arrangements ended on December 31, 2015 and weexpect to pay these within the next three months. These payments will be included in cash used in investing activities.

Other than those described above, we have not entered into any significant commitments or contractual obligations that have not been previously disclosed in our 2015 10-K.

Item 3 - Quantitative and Qualitative Disclosures about Market Risks

With respect to our quantitative and qualitative disclosures about market risks, there have been no material changes to the information included in our 2015 10-K.

We are exposed to certain market risks arising from transactions in the normal course of business, principally risks associated with foreign currency fluctuations and interest rates.

Foreign Currency Fluctuations. Our exposure to fluctuations in foreign currency exchange rates relates primarily to our foreign subsidiaries. Exchange rates impact the U.S. dollar value of our reported earnings, investments in our foreign subsidiaries, and intercompany transactions with our foreign subsidiaries. Fluctuations in currency exchange rates impact the U.S. dollar amount of our stockholders’ equity. The assets and liabilities of our non-U.S. subsidiaries are translated into U.S. dollars at the exchange rates in effect at period end. The resulting translation adjustments are recorded in stockholders’ equity as a component of accumulated other comprehensive income. Based on the relative size and nature of our foreign operations, we do not believe that a 10 percent change in the value of foreign currencies relative to the U.S. dollar would have a material impact on our financial statements.

Interest Rate Risk. Our exposure to interest rate risk is associated with our debt instruments. See the "Note 6. Long-Term Debt" in the condensed consolidated financial statements for further description of our debt instruments. A hypothetical 100 basis point change in interest rates on variable rate debt would have resulted in interest expense fluctuating approximately $7.4 million based on $741.0 million of debt outstanding for any 12-month period. We have not entered into any market risk sensitive instruments for hedging or trading purposes.

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Item 4 - Controls and Procedures

As of the end of the period covered by this report, we carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Principal Financial and Accounting Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act). Based on this evaluation, our Chief Executive Officer and Principal Financial and Accounting Officer have concluded that our disclosure controls and procedures are effective as of the end of the period covered by this report. The term “disclosure controls and procedures” means controls and other procedures of the Company that are designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within required time periods. We have established disclosure controls and procedures to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is accumulated and communicated to management, including our Chief Executive Officer and Principal Financial and Accounting Officer, as appropriate, to allow timely decisions regarding required disclosure.

There have been no changes in our internal control over financial reporting that occurred during the three months endedMarch 31, 2016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II – OTHER INFORMATION

Item 1 – Legal Proceedings

We are involved in various legal proceedings, claims and litigation arising in the ordinary course of business. However, based on the facts currently available, we do not believe that the disposition of matters that are pending or asserted will have a material effect on our financial position, results of operations or cash flows.

Item 1A – Risk Factors

Information regarding risk factors affecting our business is discussed in our 2015 10-K.

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Item 6 - Exhibits

INDEX TO EXHIBITS

Number		Footnote	Description
3.1		(1)	Amended and Restated Certificate of Incorporation of On Assignment, Inc., effective June 23, 2014
3.2		(1)	Amended and Restated Bylaws of On Assignment, Inc., effective June 23, 2014
4.1		(2)	Specimen Common Stock Certificate
10.1		*	First Amendment to Amended and Restated On Assignment, Inc. 2012 Employment Inducement Incentive Award Plan, effective as of June 5, 2015
10.2		*	On Assignment, Inc. 2010 Incentive Award Plan Form of Tranche A Award Notice and Agreement for Peter T. Dameris
31.1		*	Certification of Peter T. Dameris, President and Chief Executive Officer pursuant to Rule 13a-14(a) or 15d-14(a)
31.2		*	Certification of Edward L. Pierce, Executive Vice President and Chief Financial Officer pursuant to Rule 13a-14(a) or 15d-14(a)
32.1		*	Certification of Peter T. Dameris, President and Chief Executive Officer pursuant to 18 U.S.C. Section 1350
32.2		*	Certification of Edward L. Pierce, Executive Vice President and Chief Financial Officer pursuant to 18 U.S.C. Section 1350
101.INS		*	XBRL Instance Document
101.SCH		*	XBRL Taxonomy Extension Schema Document
101.CAL		*	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF		*	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB		*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE		*	XBRL Taxonomy Extension Presentation Linkbase Document
*	Filed herewith.
(1)	Incorporated by reference from an exhibit to our Current Report on Form 8-K filed with the SEC on June 25, 2014.
(2)	Incorporated by reference from an exhibit to our Registration Statement on Form S-1 (File No. 33-50646) declared effective by the SEC on September 21, 1992.

22

SIGNATURE

Pursuant to the requirements of the Exchange Act, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ON ASSIGNMENT, INC.
Date: May 9, 2016	By:	/s/ Edward L. Pierce
		Edward L. Pierce
		Executive Vice President and Chief Financial Officer
		(Principal Financial and Accounting Officer)

23

EX-10.1

Exhibit 10.1

FIRST AMENDMENT TO

AMENDED AND RESTATED ON ASSIGNMENT, INC.

2012 EMPLOYMENT INDUCEMENT INCENTIVE AWARD PLAN

This First Amendment (“First Amendment”) to the Amended and Restated On Assignment, Inc. 2012 Employment Inducement Incentive Award Plan (the “Plan”) is adopted by the Board of Directors (the “Board”) of On Assignment, Inc., a Delaware corporation (the “Company”), effective as of June 5, 2015. Capitalized terms used in this First Amendment and not otherwise defined shall have the same meanings assigned to them in the Plan.

RECITALS

A.  The Company currently maintains the Plan.

B. Pursuant to Section 12.1 of the Plan, the Board has the authority to amend the Plan.

C. The Board believes it to be in the best interest of the Company to amend the Plan to increase the Share Limit.

AMENDMENT

 1. The first sentence of Section 3.1(a) of the Plan is hereby amended and restated in its entirety to read as follows:

“Subject to Section 3.1(b) and Section 12.2 hereof, the aggregate number of Shares which may be issued or transferred pursuant to Awards under the Plan shall be one million two hundred thirty-five thousand eight hundred sixty-one (1,235,861) (the “Share Limit”).”

This First Amendment shall be and hereby is incorporated in and forms a part of the Plan. Except as expressly provided herein, all terms and conditions of the Plan shall remain in full force and effect.

IN WITNESS WHEREOF, the Board has caused this First Amendment to be executed by a duly authorized officer of the Company as of the 5^th day of June, 2015.

On Assignment, Inc.
By:	/s/ Peter T. Dameris
Peter T. Dameris
President and Chief Executive Officer

EX-10.2

Exhibit 10.2

ON ASSIGNMENT, INC.

2010 INCENTIVE AWARD PLAN

RESTRICTED STOCK UNIT AWARD NOTICE

On Assignment, Inc., a Delaware corporation, (the “Company”), pursuant to its 2010 Incentive Award Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”), an award of restricted stock units (“Restricted Stock Units”or“RSUs”). Each Restricted Stock Unit represents the right to receive one Share upon vesting of such Restricted Stock Unit. This award of Restricted Stock Units is subject to all of the terms and conditions set forth herein and in the Restricted Stock Unit Award Agreement attached hereto as Exhibit A (the “Restricted Stock Unit Award Agreement”) and the Plan, each of which are incorporated herein by reference. Unless otherwise defined herein, the terms defined in the Plan shall have the same defined meanings in this Grant Notice and the Restricted Stock Unit Award Agreement.

Participant:	Peter T. Dameris
Grant Date:	_________
Grant Number:	_________ (“201_ Tranche A Award”)
Total Number of RSUs:	_________
Vesting Schedule:	This 201_ Tranche A Award, which qualifies as “Performance-Based Compensation” under the Plan, shall vest on January 2, 201_, subject to Participant’s continued employment with the Company through such date and further subject to the attainment of the following performance goal: the Company achieving positive Adjusted EBITDA (as defined in that certain Second Amended and Restated Senior Executive Agreement between the Company and Participant, dated November 17, 2015 (the “Employment Agreement”)), for calendar year 201_ (the “Performance Period”).
Termination:	If Participant experiences a Termination of Service prior to the vesting date, all RSUs that have not become vested on or prior to the date of such termination of services will thereupon be governed the terms of the Restricted Stock Unit Award Agreement; provided, however, that the RSUs may also be subject to accelerated vesting provisions set forth in that certain Second Amended and Restated Executive Change of Control Agreement between the Company and Participant, dated November 17, 2015.

By his or her signature and the Company’s signature below, Participant agrees to be bound by the terms and conditions of the Plan, the Restricted Stock Unit Award Agreement and this Grant Notice. Participant has reviewed the Restricted Stock Unit Award Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Grant Notice and fully understands all provisions of this Grant Notice, the Restricted Stock Unit Award Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the Plan, this Grant Notice or the Restricted Stock Unit Award Agreement. If Participant is married, his or her spouse has signed the Consent of Spouse attached to this Grant Notice as Exhibit B.

On Assignment, Inc.:		PARTICIPANT:
By:		By:
Print Name:	Jonathan S. Holman	Print Name:	Peter T. Dameris
Title:	Chairman, Compensation Committee of the Board of Directors	Date:
Address:	26745 Malibu Hills Road
	Calabasas, CA 91301

EXHIBIT A

TO RESTRICTED STOCK UNIT AWARD GRANT NOTICE

ON ASSIGNMENT, INC. RESTRICTED STOCK UNIT AWARD AGREEMENT

Pursuant to the Restricted Stock Unit Award Grant Notice (the “Grant Notice”) to which this Restricted Stock Unit Award Agreement (this “Agreement”) is attached, On Assignment, Inc., a Delaware corporation (the “Company”), has granted to Participant an award of restricted stock units (“Restricted Stock Units”or“RSUs”) under the On Assignment, Inc. 2010 Incentive Award Plan, as amended from time to time (the “Plan”).

ARTICLE 1.

GENERAL

1.1Defined Terms. Wherever the following terms are used in this Agreement they shall have the meanings specified below, unless the context clearly indicates otherwise. Capitalized terms not specifically defined herein shall have the meanings specified in the Plan and the Grant Notice. As used herein, the term “stock unit” shall mean a non-voting unit of measurement which is deemed for bookkeeping purposes to be equivalent to one outstanding Share (subject to adjustment as provided in Section 13.2 of the Plan) solely for purposes of the Plan and this Agreement. The Restricted Stock Units shall be used solely as a device for the determination of the payment to eventually be made to Participant if such Restricted Stock Units vest pursuant to Section 2.3 hereof. The Restricted Stock Units shall not be treated as property or as a trust fund of any kind.

(a) “Termination of Consultancy” shall mean the time when the engagement of Participant as a Consultant to the Company or a Subsidiary is terminated for any reason, with or without cause, including, but not by way of limitation, by resignation, discharge, death, Disability or retirement, but excluding: (a) terminations where there is a simultaneous employment or continuing employment of Participant by the Company or any Subsidiary, and (b) terminations where there is a simultaneous re-establishment of a consulting relationship or continuing consulting relationship between Participant and the Company or any Subsidiary. The Administrator, in its absolute discretion, shall determine the effect of all matters and questions relating to Termination of Consultancy, including, but not by way of limitation, the question of whether a particular leave of absence constitutes a Termination of Consultancy. Notwithstanding any other provision of the Plan, the Company or any Subsidiary has an absolute and unrestricted right to terminate a Consultant’s service at any time for any reason whatsoever, with or without cause, except to the extent expressly provided otherwise in writing.

(b)“Termination of Directorship” shall mean the time when Participant, if he or she is or becomes a Non-Employee Director, ceases to be a Director for any reason, including, but not by way of limitation, a termination by resignation, failure to be elected, death or retirement. The Board, in its sole and absolute discretion, shall determine the effect of all matters and questions relating to Termination of Directorship with respect to a Non-Employee Director.

(c)“Termination of Employment” shall mean the time when the employee-employer relationship between Participant and the Company or any Subsidiary is terminated for any reason, with or without cause, including, but not by way of limitation, a termination by resignation, discharge, death, Disability or retirement; but excluding: (a) terminations where there is a simultaneous reemployment or continuing employment of Participant by the Company or any Subsidiary, and (b) terminations where there is a simultaneous establishment of a consulting relationship or continuing consulting relationship between Participant and the Company or any Subsidiary. The Administrator, in its absolute discretion, shall determine the effect of all matters and questions relating to Termination of Employment, including, but not by way of limitation, the question of whether a particular leave of absence constitutes a Termination of Employment.

(d)“Termination of Services” shall mean Participant’s Termination of Consultancy, Termination of Directorship or Termination of Employment, as applicable.

A-1

1.2Incorporation of Terms of Plan. The RSUs are subject to the terms and conditions of the Plan which are incorporated herein by reference. In the event of any inconsistency between the Plan and this Agreement, the terms of the Plan shall control.

ARTICLE 2.

GRANT OF RESTRICTED STOCK UNITS

2.1Grant of RSUs. In consideration of Participant’s past and/or continued employment with or service to the Company or a Subsidiary and for other good and valuable consideration, effective as of the Grant Date set forth in the Grant Notice (the “Grant Date”), the Company grants to Participant an award of RSUs as set forth in the Grant Notice, upon the terms and conditions set forth in the Plan and this Agreement.

2.2Company’s Obligation to Pay. Each RSU has a value equal to the Fair Market Value of a Share on the date it becomes vested. Unless and until the RSUs will have vested in the manner set forth in Article 2 hereof, Participant will have no right to payment of any such RSUs. Prior to actual payment of any vested RSUs, such RSUs will represent an unsecured obligation of the Company, payable (if at all) only from the general assets of the Company.

2.3Vesting Schedule. Subject to Section 2.5 hereof, the RSUs awarded by the Grant Notice will vest and become nonforfeitable with respect to the applicable portion thereof according to the vesting schedule set forth on the Grant Notice to which this Agreement is attached (the “Vesting Schedule”), subject to Participant’s continued employment or services through the applicable vesting dates, as a condition to the vesting of the applicable installment of the RSUs and the rights and benefits under this Agreement. Unless otherwise determined by the Administrator, partial employment or service, even if substantial, during any vesting period will not entitle Participant to any proportionate vesting or avoid or mitigate a termination of rights and benefits upon or following a Termination of Services as provided in Section 2.5 hereof or under the Plan.

2.4Consideration to the Company. In consideration of the grant of the award of RSUs by the Company, Participant agrees to render faithful and efficient services to the Company or any Subsidiary. Nothing in the Plan or this Agreement shall confer upon Participant any right to continue in the employ or service of the Company or any Subsidiary or shall interfere with or restrict in any way the rights of the Company and its Subsidiaries, which rights are hereby expressly reserved, to discharge or terminate the services of Participant at any time for any reason whatsoever, with or without cause, except to the extent expressly provided otherwise in a written agreement between the Company or a Subsidiary and Participant.

2.5Forfeiture, Termination and Cancellation upon Termination of Services. Notwithstanding any contrary provision of this Agreement, upon Participant’s Termination of Services for any or no reason, all then unvested RSUs subject to this Agreement (after taking into account any accelerated vesting that may occur in connection with such Termination of Service) will thereupon be automatically forfeited, terminated and cancelled as of the applicable termination date without payment of any consideration by the Company, and Participant, or Participant’s beneficiary or personal representative, as the case may be, shall have no further rights hereunder.

2.6Payment upon Vesting.

(a)As soon as administratively practicable following the vesting of any Restricted Stock Units pursuant to Section 2.3 hereof, but in no event later than sixty (60) days after such vesting date (for the avoidance of doubt, this deadline is intended to comply with the “short-term deferral” exemption from Section 409A of the Code), the Company shall deliver to Participant (or any transferee permitted under Section 3.2 hereof) a number of Shares (either by delivering one or more certificates for such shares or by entering such shares in book entry form, as determined by the Company in its sole discretion) equal to the number of Restricted Stock Units subject to this award that vest on the applicable vesting date, unless such Restricted Stock Units terminate prior to the given vesting date pursuant to Section 2.5 hereof. Notwithstanding the foregoing, in the event Shares cannot be issued pursuant to Section 2.7(a), (b) or (c) hereof, then the Shares shall be issued pursuant to the preceding sentence as soon as administratively practicable after the Administrator determines that Shares can again be issued in accordance with Sections 2.7(a), (b) and (c) hereof.

A-2

(b)Notwithstanding anything to the contrary in this Agreement, the Company shall be entitled to require payment by Participant of any sums required by applicable law to be withheld with respect to the grant of RSUs or the issuance of Shares. Such payment shall be made by deduction from other compensation payable to Participant or in such other form of consideration acceptable to the Company which may, in the sole discretion of the Administrator, include:

i.Cash or check;

ii. Surrender of Shares (including, without limitation, Shares otherwise issuable under the RSUs) held for such period of time as may be required by the Administrator in order to avoid adverse accounting consequences and having a Fair Market Value on the date of delivery equal to the minimum amount required to be withheld by statute; or

iii.Other property acceptable to the Administrator (including, without limitation, through the delivery of a notice that Participant has placed a market sell order with a broker with respect to Shares then issuable under the RSUs, and that the broker has been directed to pay a sufficient portion of the net proceeds of the sale to the Company in satisfaction of its withholding obligations; provided that payment of such proceeds is then made to the Company at such time as may be required by the Company, but in any event not later than the settlement of such sale).

The Company shall not be obligated to deliver any new certificate representing Shares to Participant or Participant’s legal representative or enter such Share in book entry form unless and until Participant or Participant’s legal representative shall have paid or otherwise satisfied in full the amount of all federal, state and local taxes applicable to the taxable income of Participant resulting from the grant or vesting of the RSUs or the issuance of Shares.

2.7Conditions to Delivery of Stock. Subject to Section 2.6, the Shares deliverable hereunder, or any portion thereof, may be either previously authorized but unissued Shares or issued Shares which have then been reacquired by the Company. Such Shares shall be fully paid and nonassessable. The Company shall not be required to issue or deliver any Shares deliverable hereunder or portion thereof prior to fulfillment of all of the following conditions:

(a)The admission of such Shares to listing on all stock exchanges on which such Shares are then listed;

(b)The completion of any registration or other qualification of such Shares under any state or federal law or under rulings or regulations of the Securities and Exchange Commission or of any other governmental regulatory body, which the Administrator shall, in its absolute discretion, deem necessary or advisable;

(c)The obtaining of any approval or other clearance from any state or federal governmental agency which the Administrator shall, in its absolute discretion, determine to be necessary or advisable;

(d)The receipt by the Company of full payment for such Shares, including payment of any applicable withholding tax, which may be in one or more of the forms of consideration permitted under Section 2.6 hereof; and

(e)The lapse of such reasonable period of time following the vesting of any Restricted Stock Units as the Administrator may from time to time establish for reasons of administrative convenience.

2.8Rights as Stockholder. The holder of the RSUs shall not be, nor have any of the rights or privileges of, a stockholder of the Company, including, without limitation, voting rights and rights to dividends, in respect of the RSUs and any Shares underlying the RSUs and deliverable hereunder unless and until such Shares shall have been issued by the Company and held of record by such holder (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company). No adjustment will be made for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Section 13.2 of the Plan.

A-3

ARTICLE 3.

OTHER PROVISIONS

3.1Administration. The Administrator shall have the power to interpret the Plan and this Agreement and to adopt such rules for the administration, interpretation and application of the Plan as are consistent therewith and to interpret, amend or revoke any such rules. All actions taken and all interpretations and determinations made by the Administrator in good faith shall be final and binding upon Participant, the Company and all other interested persons. Neither any person or persons acting as the Administrator and nor any member of the Committee or the Board shall be personally liable for any action, determination or interpretation made in good faith with respect to the Plan, this Agreement or the RSUs.

3.2Grant is Not Transferable. During the lifetime of Participant, the RSUs may not be sold, pledged, assigned or transferred in any manner other than by will or the laws of descent and distribution, unless and until the Shares underlying the RSUs have been issued, and all restrictions applicable to such Shares have lapsed. Neither the RSUs nor any interest or right therein shall be liable for the debts, contracts or engagements of Participant or his or her successors in interest or shall be subject to disposition by transfer, alienation, anticipation, pledge, encumbrance, assignment or any other means whether such disposition be voluntary or involuntary or by operation of law by judgment, levy, attachment, garnishment or any other legal or equitable proceedings (including bankruptcy), and any attempted disposition thereof shall be null and void and of no effect, except to the extent that such disposition is permitted by the preceding sentence.

3.3Binding Agreement. Subject to the limitation on the transferability of the RSUs contained herein, this Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and assigns of the parties hereto.

3.4Adjustments Upon Specified Events. The Administrator may accelerate payment and vesting of the Restricted Stock Units in such circumstances as it, in its sole discretion, may determine. In addition, upon the occurrence of certain events relating to the Shares contemplated by Section 13.2 of the Plan (including, without limitation, an extraordinary cash dividend on such Stock), the Administrator shall make such adjustments the Administrator deems appropriate in the number of Restricted Stock Units then outstanding and the number and kind of securities that may be issued in respect of the Restricted Stock Units. Participant acknowledges that the RSUs are subject to amendment, modification and termination in certain events as provided in this Agreement and under the Plan, including without limitation, under Section 13.2 of the Plan.

3.5Notices. Any notice to be given under the terms of this Agreement to the Company shall be addressed to the Company in care of the Secretary of the Company at the Company’s principal office, and any notice to be given to Participant shall be addressed to Participant at Participant’s last address reflected on the Company’s records. By a notice given pursuant to this Section 3.5, either party may hereafter designate a different address for notices to be given to that party. Any notice shall be deemed duly given when sent via email or when sent by certified mail (return receipt requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service.

3.6Titles. Titles are provided herein for convenience only and are not to serve as a basis for interpretation or construction of this Agreement.

3.7Governing Law. The laws of the State of California shall govern the interpretation, validity, administration, enforcement and performance of the terms of this Agreement regardless of the law that might be applied under principles of conflicts of laws.

3.8Conformity to Securities Laws. Participant acknowledges that the Plan and this Agreement are intended to conform to the extent necessary with all provisions of the Securities Act and the Exchange Act and any and all regulations and rules promulgated by the Securities and Exchange Commission thereunder, and state securities laws and regulations. Notwithstanding anything herein to the contrary, the Plan shall be administered, and the RSUs

A-4

are granted, only in such a manner as to conform to such laws, rules and regulations. To the extent permitted by applicable law, the Plan and this Agreement shall be deemed amended to the extent necessary to conform to such laws, rules and regulations.

3.9Amendments, Suspension and Termination. To the extent permitted by the Plan, this Agreement may be wholly or partially amended or otherwise modified, suspended or terminated at any time or from time to time by the Administrator; provided that, except as may otherwise be provided by the Plan, no amendment, modification, suspension or termination of this Agreement shall adversely affect the RSUs in any material way without the prior written consent of Participant.

3.10Successors and Assigns. The Company may assign any of its rights under this Agreement to single or multiple assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth in Section 3.2 hereof, this Agreement shall be binding upon Participant and his or her heirs, executors, administrators, successors and assigns.

3.11Limitations Applicable to Section 16 Persons. Notwithstanding any other provision of the Plan or this Agreement, if Participant is subject to Section 16 of the Exchange Act, the Plan, the RSUs and this Agreement shall be subject to any additional limitations set forth in any applicable exemptive rule under Section 16 of the Exchange Act (including any amendment to Rule 16b-3 of the Exchange Act) that are requirements for the application of such exemptive rule. To the extent permitted by applicable law, this Agreement shall be deemed amended to the extent necessary to conform to such applicable exemptive rule.

3.12Entire Agreement. The Plan, the Grant Notice and this Agreement constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof.

3.13Section 409A. The RSUs are not intended to constitute “nonqualified deferred compensation” within the meaning of Section 409A of the Code (together with any Department of Treasury regulations and other interpretive guidance issued thereunder, including without limitation any such regulations or other guidance that may be issued after the date hereof, “Section 409A”). However, notwithstanding any other provision of the Plan, the Grant Notice or this Agreement, if at any time the Administrator determines that the RSUs (or any portion thereof) may be subject to Section 409A, the Administrator shall have the right in its sole discretion (without any obligation to do so or to indemnify Participant or any other person for failure to do so) to adopt such amendments to the Plan, the Grant Notice or this Agreement, or adopt other policies and procedures (including amendments, policies and procedures with retroactive effect), or take any other actions, as the Administrator determines are necessary or appropriate either for the RSUs to be exempt from the application of Section 409A or to comply with the requirements of Section 409A.

3.14Limitation on Participant’s Rights. Participation in the Plan confers no rights or interests other than as herein provided. This Agreement creates only a contractual obligation on the part of the Company as to amounts payable and shall not be construed as creating a trust. Neither the Plan nor any underlying program, in and of itself, has any assets. Participant shall have only the rights of a general unsecured creditor of the Company with respect to amounts credited and benefits payable, if any, with respect to the RSUs, and rights no greater than the right to receive the Shares as a general unsecured creditor with respect to RSUs, as and when payable hereunder.

A-5

EXHIBIT B

TO RESTRICTED STOCK UNIT AWARD NOTICE

CONSENT OF SPOUSE

I, ____________________, spouse of ____________________, have read and approve the foregoing On Assignment, Inc. Restricted Stock Unit Award Agreement (the “Agreement”). In consideration of issuing to my spouse the shares of the common stock of On Assignment, Inc. set forth in the Agreement, I hereby appoint my spouse as my attorney-in-fact in respect to the exercise of any rights under the Agreement and agree to be bound by the provisions of the Agreement insofar as I may have any rights in said Agreement or any shares of the common stock of On Assignment, Inc. issued pursuant thereto under the community property laws or similar laws relating to marital prop-erty in effect in the state of our residence as of the date of the signing of the foregoing Agreement.

Dated: ________________________ ________________________________________

Signature of Spouse

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO RULES 13a-14(a) 

UNDER THE SECURITIES EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Peter T. Dameris, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2016 of On Assignment, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 9, 2016

/s/ Peter T. Dameris

Peter T. Dameris

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO RULES 13a-14(a) 

UNDER THE SECURITIES EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Edward L. Pierce certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2016 of On Assignment, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to theperiod covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

 (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 9, 2016

/s/ Edward L. Pierce

Edward L. Pierce

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

The undersigned, the Chief Executive Officer of On Assignment, Inc. (the "Company"), hereby certifies that, to his knowledge on the date hereof:

(a) the Quarterly Report on Form 10-Q of the Company for the period ended March 31, 2016 filed on the date hereof with the Securities and Exchange Commission (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(b) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 9, 2016	By:	/s/ Peter T. Dameris
		Peter T. Dameris
		President and Chief Executive Officer

EX-32.2

Exhibit 32.2

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

The undersigned, the Chief Financial Officer of On Assignment, Inc. (the "Company"), hereby certifies that, to his knowledge on the date hereof:

(a) the Quarterly Report on Form 10-Q of the Company for the period ended March 31, 2016 filed on the date hereof with the Securities and Exchange Commission (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(b) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 9, 2016	By:	/s/ Edward L. Pierce
		Edward L. Pierce
		Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 05, 2016
Entity Information [Line Items]
Entity Registrant Name	ON ASSIGNMENT INC
Entity Central Index Key	0000890564
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		53,380,314

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash	$ 28,369	$ 23,869
Accounts receivable, net of allowance of $7,284 and $6,682, respectively	378,087	354,808
Prepaid expenses and income taxes	8,849	12,686
Workerscompensationreceivable	13,278	13,238
Other current assets	3,585	9,607
Total current assets	432,168	414,208
Property and equipment, net	54,481	53,196
Goodwill	875,657	874,906
Identifiable intangible assets, net	408,099	417,925
Other non-current assets	6,650	7,072
Total assets	1,777,055	1,767,307
Current liabilities:
Accounts payable	6,164	9,132
Accrued payroll and contract professional pay	110,886	88,100
Workers’ compensation loss reserves	14,910	15,020
Income taxes payable	3,157	673
Other current liabilities	40,637	47,425
Total current liabilities	175,754	160,350
Long-term debt	723,219	755,508
Deferred income tax liabilities	61,612	61,539
Other long-term liabilities	5,033	5,116
Total liabilities	$ 965,618	$ 982,513
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, $0.01 par value, 1,000,000 shares authorized, no shares issued	$ 0	$ 0
Common stock, $0.01 par value, 75,000,000 shares authorized, 53,344,395 and 53,024,972 issued and outstanding, respectively	533	530
Paid-in capital	550,755	542,859
Retained earnings	266,968	249,567
Accumulated other comprehensive loss	(6,819)	(8,162)
Total stockholders’ equity	811,437	784,794
Total liabilities and stockholders’ equity	$ 1,777,055	$ 1,767,307

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Accounts receivable, allowance	$ 7,284	$ 6,682
Stockholders’ equity:
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred Stock, shares issued (in shares)	0	0
Preferred Stock, shares outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	75,000,000	75,000,000
Common Stock, shares issued (in shares)	53,344,395	53,024,972
Common Stock: shares outstanding (in shares)	53,344,395	53,024,972

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues	$ 582,040	$ 430,045
Cost of services	394,258	294,170
Gross profit	187,782	135,875
Selling, general and administrative expenses	139,881	105,935
Amortization of intangible assets	10,144	4,869
Operating income	37,757	25,071
Interest expense, net	(9,025)	(3,067)
Income before income taxes	28,732	22,004
Provision for income taxes	11,384	8,981
Income from continuing operations	17,348	13,023
Gain on sale of discontinued operations, net of income taxes	0	25,703
Income from discontinued operations, net of income taxes	53	409
Net income	$ 17,401	$ 39,135
Basic earnings per common share:
Income from continuing operations	$ 0.33	$ 0.25
Discontinued operations	0.00	0.51
Net income	0.33	0.76
Diluted earnings per common share:
Income from continuing operations	0.32	0.25
Discontinued operations	0.00	0.50
Net income	$ 0.32	$ 0.75
Number of shares and share equivalents used to calculate earnings per share:
Basic	53,147	51,519
Diluted	53,644	52,209
Reconciliation of net income to comprehensive income:
Net income	$ 17,401	$ 39,135
Changes in fair value of derivative, net of tax	0	47
Foreign currency translation adjustment	1,343	(3,724)
Comprehensive income	$ 18,744	$ 35,458

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net income	$ 17,401	$ 39,135
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of discontinued operations, net of income taxes	0	(25,703)
Depreciation and amortization	15,427	8,665
Stock-based compensation	6,924	3,954
Gross excess tax benefits from stock-based compensation	(914)	(1,643)
Workers’ compensation provision	549	586
Other	4,308	1,930
Changes in operating assets and liabilities:
Accounts receivable	(25,362)	(14,584)
Prepaid expenses and income taxes	3,847	7,954
Accounts payable	(2,290)	205
Accrued payroll and contract professional pay	22,640	3,160
Income taxes payable	3,067	(539)
Workers’ compensation loss reserves	(699)	(309)
Other	(7,584)	(2,868)
Net cash provided by operating activities	37,314	19,943
Cash Flows from Investing Activities:
Cash paid for property and equipment	(7,282)	(8,000)
Cash received from sale of discontinued operations, net	6,000	114,884
Other	176	12
Net cash provided by (used in) investing activities	(1,106)	106,896
Cash Flows from Financing Activities:
Principal payments of long-term debt	(33,000)	(80,563)
Proceeds from option exercises and employee stock purchase plan	4,023	3,555
Payment of employment taxes related to release of restricted stock awards	(3,590)	(3,991)
Gross excess tax benefits from stock-based compensation	914	1,643
Repurchase of common stock	0	(1,645)
Debt issuance or amendment costs	0	(486)
Net cash used in financing activities	(31,653)	(81,487)
Effect of exchange rate changes on cash and cash equivalents	(55)	(703)
Net Increase (Decrease) in Cash and Cash Equivalents	4,500	44,649
Cash and Cash Equivalents at Beginning of Year	23,869	31,714
Cash and Cash Equivalents at End of Period	28,369	76,363
Supplemental Disclosure of Cash Flow Information:
Income taxes	3,926	1,142
Interest	7,261	2,695
Supplemental Disclosure of Non-Cash Transactions:
Acquisition of property and equipment through accounts payable	$ 287	$ 1,011

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Financial Statement Presentation

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Financial Statement Presentation

1. Financial Statement Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and the rules of the Securities and Exchange Commission (the "SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations. The December 31, 2015 condensed consolidated balance sheet was derived from audited financial statements. The financial statements include adjustments consisting of normal recurring items, which, in the opinion of management, are necessary for a fair presentation of the financial position of On Assignment, Inc. and its subsidiaries (the "Company") and its results of operations for the interim dates and periods set forth herein. The results for any of the interim periods are not necessarily indicative of the results to be expected for the full year or any other period. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 ("2015 10-K").

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Accounting Standards Updates (Notes)

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Accounting Standards Update

2. Accounting Standards Update

In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40). ASU No. 2015-05 provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. It is effective for annual periods (including interim periods) beginning after December 15, 2015, and early adoption is permitted. The Company prospectively adopted ASU 2015-05 as of January 1, 2016, with no impact to its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which is intended to improve financial reporting about leasing transactions. This standard requires a lessee to record on the balance sheet the assets and liabilities for the rights and obligations created by lease terms of more than 12 months. It is effective for annual periods (including interim periods) beginning after December 15, 2018, and early adoption is permitted. The Company is currently evaluating the impact the provisions of ASU 2016-02 will have on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718), which is intended to simplify the accounting for the taxes related to stock-based compensation, including adjustments to how excess tax benefits and a company's payments for tax withholdings should be classified. It is effective for annual periods (including interim periods) beginning after December 15, 2016, and early adoption is permitted. The Company is currently evaluating the impact the provisions of ASU 2016-09 will have on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606)-Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606)-Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. These standards, pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date (Topic 606) issued by the FASB in August 2015, will be effective for annual periods (including interim periods) beginning after December 15, 2017. The Company is currently evaluating the impact these provisions will have on its consolidated financial statements.

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Acquisitions

3 Months Ended

Mar. 31, 2016

Acquisitions [Abstract]

Business Combination Disclosure [Text Block]

3. Acquisitions

On June 5, 2015, the Company acquired all of the outstanding shares of the holding company for Creative Circle, LLC ("Creative Circle"). Creative Circle, which is headquartered in Los Angeles, California, was purchased to expand the Company’s technical and creative staffing services. The purchase price consisted of $540.0 million cash, $30.2 million of common stock (794,700 shares of the Company’s common stock), and estimated future contingent consideration which was valued at $13.8 million. Goodwill related to this acquisition totaled $358.0 million, and is deductible for income tax purposes. Acquisition expenses of approximately $5.7 million were expensed in 2015 and are included in selling, general and administrative expenses ("SG&A"). The results of operations for the acquisition have been combined with those of the Company from the acquisition date.

On April 14, 2015, the Company acquired all of the outstanding shares of LabResource B.V. ("LabResource") headquartered in Amsterdam, Netherlands for $12.7 million. LabResource was purchased to expand the Company's life sciences staffing business in Europe. Goodwill associated with this acquisition is not deductible for tax purposes. Acquisition expenses of approximately $0.4 million were expensed in 2015 and are included in SG&A. The results of operations for this acquisition have been combined with those of the Company from the acquisition date.

Assets and liabilities of the acquired companies were recorded at their estimated fair values at the dates of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill. The fair value assigned to identifiable intangible assets was determined primarily by using a discounted cash flow method. The Company's allocation of the purchase price of Creative Circle and LabResource has been finalized and the following table summarizes the allocations (in thousands):

	Creative Circle		LabResource
Cash	$	4,840	$	187
Accounts receivable	34,386		1,643
Prepaid expenses and other current assets	4,462		—
Property and equipment	5,077		12
Goodwill	358,029		6,449
Identifiable intangible assets	194,500		7,528
Other	651		—
Total assets acquired	$	601,945	$	15,819
Current liabilities	$	12,254	$	1,482
Other	—		1,882
Total liabilities assumed	12,254		3,364
Total purchase price (1) (2)	$	589,691	$	12,455

(1) Excluding cash acquired and a $0.9 million adjustment for net working capital in excess of the targeted amount (thereby increasing the actual purchase price paid), the purchase price for Creative Circle was $584.0 million as described in the discussion above.

(2) Excluding cash acquired and a $0.4 million adjustment for net working capital that was less than the targeted amount (thereby reducing the actual purchase price paid), the purchase price for LabResource was $12.7 million as described in the discussion above.

The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions:

		Identifiable Intangible Asset Value
	Useful life	Creative Circle		LabResource
Contractor relationships	2 - 4 years	$	29,500	$	947
Customer relationships	2 - 10 years	90,700		5,421
Non-compete agreements	2 - 6 years	7,300		20
Favorable contracts	5 years	900		—
Trademarks	indefinite	66,100		1,140
Total identifiable intangible assets acquired		$	194,500	$	7,528

The summary below (in thousands, except for per share data) presents pro forma unaudited consolidated results of operations for the three months ended March 31, 2015 as if the acquisitions of Creative Circle and LabResource occurred on January 1, 2014. The pro forma financial information gives effect to certain adjustments, including amortization of intangible assets, interest expense on acquisition-related debt, provision for income taxes, and increased number of common shares as a result of the acquisitions. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition. The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisitions had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.

Revenues	$	494,708
Income from continuing operations	$	13,955
Net income	$	40,067
Basic earnings per share:
Income from continuing operations	$	0.27
Net income	$	0.77
Diluted earnings per share:
Income from continuing operations	$	0.26
Net income	$	0.76
Number of shares and share equivalents used to calculate earnings per share:
Basic	52,314
Diluted	53,046

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Discontinued Operations

3 Months Ended

Mar. 31, 2016

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

4. Discontinued Operations

On February 1, 2015, the Company completed the sale of its Physician Segment for $123.0 million including $6.0 million that was held in escrow and was released in March 2016. The gain on the sale was $25.7 million (net of income taxes of $14.4 million). The operating results of this segment are presented as discontinued operations in the condensed consolidated statements of operations and comprehensive income for all periods presented.

Cash flows from discontinued operations are included in the condensed consolidated statements of cash flows for the three months ended March 31, 2016 and 2015. The cash flows that are attributable to the Physician Segment are as follows (in thousands):

	Three Months Ended
	March 31,
	2016		2015
Net cash provided by (used in) operating activities	$	53	$	(1,778	)
Net cash provided by investing activities:
Cash received from sale of discontinued operations, net	$	6,000	$	114,884
Other	—		(14		)
Total cash provided by investing activities	$	6,000	$	114,870

The following is a summary of the operating results of all of the Company's discontinued operations (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Revenues	$	—		$	12,068
Costs of services	—			8,653
Gross profit	—			3,415
Selling, general and administrative expenses	(85		)	2,641
Amortization of intangible assets	—			155
Income before income taxes	85			619
Provision for income taxes	32			210
Income from discontinued operations, net of income taxes	$	53		$	409

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Goodwill and Identifiable Assets

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

5. Goodwill and Identifiable Intangible Assets

The changes in the carrying amount of goodwill for the year ended December 31, 2015 and the three months endedMarch 31, 2016 are as follows (in thousands):

	Apex Segment			Oxford Segment			Total
Balance as of December 31, 2014	$	287,951		$	224,109		$	512,060
Creative Circle Acquisition	358,029			—			358,029
LabResource Acquisition	—			6,449			6,449
Translation adjustment	(1,363		)	(269		)	(1,632		)
Balance as of December 31, 2015	644,617			230,289			874,906
Translation adjustment	355			396			751
Balance as of March 31, 2016	$	644,972		$	230,685		$	875,657

Acquired intangible assets consisted of the following (in thousands):

		As of March 31, 2016						As of December 31, 2015
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Subject to amortization:
Customer relationships	2 - 10 years	$	196,780	$	80,781	$	115,999	$	196,472	$	74,640	$	121,832
Contractor relationships	2 - 5 years	69,813		42,991		26,822		69,764		40,124		29,640
Non-compete agreements	2 - 7 years	10,889		3,626		7,263		10,874		3,163		7,711
In-use software	6 years	18,900		7,304		11,596		18,900		6,516		12,384
Favorable contracts	5 years	900		242		658		900		172		728
		297,282		134,944		162,338		296,910		124,615		172,295
Not subject to amortization:
Trademarks		245,761		—		245,761		245,630		—		245,630
Total		$	543,043	$	134,944	$	408,099	$	542,540	$	124,615	$	417,925

Amortization expense for intangible assets with finite lives was $10.1 million and $4.9 million for the three months ended March 31, 2016 and 2015, respectively. Estimated amortization expense for the remainder of this year, each of the next four years, and thereafter is as follows (in thousands): 

2016	$	29,515
2017	33,054
2018	28,928
2019	22,016
2020	14,515
Thereafter	34,310
	$	162,338

Goodwill and other intangible assets having an indefinite useful life are not amortized for financial statement purposes. These assets are reviewed for impairment on an annual basis as of October 31 and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. There were no triggering events that required an interim impairment analysis during the current period.

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Long-Term Debt

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Long-Term Debt

6. Long-Term Debt

Long-term debt consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
$150 million revolving credit facility, due June 2020	$	34,000		$	50,000
$825 million Term B loan facility, due June 2022	707,000			724,000
	741,000			774,000
Unamortized deferred loan costs	(17,781		)	(18,492		)
	$	723,219		$	755,508

On June 5, 2015, the Company entered into a new $975.0 million credit facility. The funds were used to repay the old credit facility and to fund the cash portion of the purchase of Creative Circle (see "Note 3. Acquisitions"). The new facility consists of (i) an $825.0 million seven-year term B loan facility and (ii) a $150.0 million five-year revolving loan facility. Under terms of the new facility, the Company has the ability to increase the principal amount of the loan facilities.

Borrowings under the term B loan bear interest at LIBOR (floor of 75 basis points), plus 3.0 percent and borrowings under the revolving credit facility bear interest at LIBOR (or the bank’s base rate) plus 0.75 to 2.5 percent depending on leverage levels. A commitment fee of 0.25 to 0.40 percent is payable on the undrawn portion of the revolving credit facility. At March 31, 2016, the weighted average interest rate was 3.7 percent.

Under terms of the credit facility, the Company was required to make minimum quarterly payments of $2.1 million. Through March 31, 2016, the Company repaid $134.0 million, and as a result, the next required payments will be on the maturity dates. The Company is also required to make mandatory prepayments, subject to specified exceptions, from excess cash flow and with the proceeds of asset sales, debt issuances and specified other events.

The Company's obligations under the credit facility are guaranteed by substantially all of its direct and indirect domestic subsidiaries and are secured by a lien on substantially all of the Company's tangible and intangible property and by a pledge of all of the equity interests in its direct and indirect domestic subsidiaries.

The credit facility includes various restrictive covenants including the maximum ratio of consolidated funded debt to consolidated EBITDA (4.25 to 1.00 as of March 31, 2016 decreasing to 3.25 to 1.00 on March 31, 2018). The credit facility also contains certain customary limitations including, among other terms and conditions, the Company's ability to incur additional indebtedness, engage in mergers and acquisitions, and declare dividends. At March 31, 2016 the Company had a ratio of consolidated funded debt to consolidated EBITDA of 2.80 to 1.00.

At March 31, 2016 the Company was in compliance with all of its debt covenants and had $112.5 million of borrowing available under the revolving credit facility.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

7. Commitments and Contingencies

The Company has entered into various non-cancelable operating leases, primarily related to its facilities and certain office equipment used in the ordinary course of business. The Company leases two properties owned by related parties. Rent expense for these two properties was$0.3 millionfor thethree months ended March 31, 2016and2015.

The Company carries large retention policies for its workers’ compensation liability exposures. The workers' compensation loss reserves are based upon an actuarial report obtained from a third party and determined based on claims filed and claims incurred but not reported. The Company accounts for claims incurred but not yet reported based on estimates derived from historical claims experience and current trends of industry data. Changes in estimates, differences in estimates, and actual payments for claims, are recognized in the period that the estimates changed or the payments were made. The workers' compensation loss reserves were approximately $1.6 million and $1.8 million, net of anticipated insurance and indemnification recoveries of $13.3 million and $13.2 million, at March 31, 2016 and December 31, 2015, respectively. The Company has unused stand-by letters of credit outstanding to secure obligations for workers’ compensation claims with various insurance carriers. The unused stand-by letters of credit at March 31, 2016 and December 31, 2015 were $3.5 million.

The Company is subject to contingent consideration agreements entered into in connection with certain of its acquisitions. If the acquired businessesmeet predetermined targets, the Company is obligated to make additional cash payments in accordance with the terms ofsuch contingent consideration agreements, see note "8. Fair Value Measurements."

Certain employees participate in the Company’s Change in Control Severance Plan, or have separate agreements that provide for certain benefits in the event of termination at the Company's convenience or following a change in control, as defined by the plan or agreement. Generally, these benefits are based on the employee’s length of service and position with the Company and include, severance, continuation of health insurance and in certain cases acceleration of vesting of option or stock awards.

Legal Proceedings

The Company is involved in various legal proceedings, claims and litigation arising in the ordinary course of business. Based on the facts currently available, the Company does not believe that the disposition of matters that are pending or asserted will have a material effect on its consolidated financial statements.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

8. Fair Value Measurements

The recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value based on their short-term nature. Long-term debt recorded in theCompany’s condensed consolidated balance sheet atMarch 31, 2016was$723.2 million (net of $17.8 million of unamortized deferred loan costs, see "Note 6. Long-Term Debt"). The fair value of the long-term debt at that same date was$744.5 million as determined using the quoted price technique, based on Level 2 inputs (significant observable inputs other than quoted prices for identical assets in active markets) from the fair value hierarchy, and included the yields of comparable companies with similar credit characteristics.

Related to its acquisitions, atMarch 31, 2016, the Company had obligations to pay contingent consideration in cash if certain performance targets were met. The fair value of this contingent consideration was determined using an expected present value technique. Expected cash flows were determined using the probability-weighted average of possible outcomes that would occur should certain financial metrics be reached. There is no market data available to use in valuing the contingent consideration, therefore, the Company developed its own assumptions related to the future financial performance of the businesses to evaluate the fair value of these liabilities. As such, the contingent consideration is classified within Level 3 inputs (unobservable inputs) from the fair value hierarchy.The fair value of the liability for contingent consideration is established at the time of the acquisition and finalized by the end of the measurement period. Its fair value is thenremeasured on a recurring basis with changes due to the accretion of the present value discount, recorded in interest expense and changes related to new developments in expected performance, recorded in SG&A. At March 31, 2016, the contingent consideration was determined to be$21.6 millionand is included in other current liabilities. The Company expects to make the contingent consideration payments within the next three months. At December 31, 2015, contingent consideration was $21.0 million and was included in other current liabilities. The performance period for these contingent consideration arrangements ended on December 31, 2015.

The following table summarizes the balance of the contingent consideration and changes for the periods presented (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Balance at beginning of period	$	(20,981	)	$	(3,000	)
Additions for acquisitions	—			—
Payments on contingent consideration	—			—
Fair value adjustment	(613		)	—
Foreign currency translation adjustment	—			—
Balance at end of period	$	(21,594	)	$	(3,000	)

Certain assets and liabilities, such as goodwill, are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (e.g., when there is evidence of impairment). For the three months endedMarch 31, 2016and 2015, no fair value adjustments were required for non-financial assets or liabilities.

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Accumulated Other Comprehensive Income (Notes)

3 Months Ended

Mar. 31, 2016

Accumulated Other Comprehensive Income (Loss) [Line Items]

Comprehensive Income (Loss) Note [Text Block]

9. Accumulated Other Comprehensive Loss

The accumulated other comprehensive loss balance at March 31, 2016 and December 31, 2015, and the activity during the three months endedMarch 31, 2016, consists of foreign currency translation adjustments.

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Stock-based compensation

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Incentive Award Plan and Employee Stock Purchase Plan

10. Stock-based Compensation

On March 31, 2016, the Company issued 128,518 shares of common stock under its Employee Stock Purchase Plan, as amended (the "ESPP").

Stock-based compensation expense, including the ESPP, was $6.9 million and $4.0 million for the three months endedMarch 31, 2016 and 2015, respectively, which was included in SG&A expense.

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Earnings per share

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Earnings per share

11. Earnings Per Share

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2016	2015
Weighted average number of common shares outstanding used to compute basic earnings per share	53,147	51,519
Dilutive effect of stock-based awards	497	690
Number of shares used to compute diluted earnings per share	53,644	52,209

There were 473,000 share equivalents outstanding during the three months ended March 31, 2016 that were excluded from the computation of diluted earnings per share because the exercise price for these options was greater than the average market price of the Company’s shares of common stock and became anti-dilutive when applying the treasury stock method. During the three months ended March 31, 2015 there were no significant share equivalents outstanding that were excluded from the computation of diluted earnings per share because they became anti-dilutive when applying the treasury stock method.

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Income Taxes

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

12. Income Taxes

For interim reporting periods, the Company estimates its full-year income and the related income tax expense for each jurisdiction in which the Company operates. Changes in the geographical mix, permanent differences or estimated level of annual pre-tax income can impact the Company’s actual effective rate.

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Segment Reporting

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment Reporting

13. Segment Reporting

On Assignment provides services through two operating segments, the Apex Segment and the Oxford Segment, with each addressing different sectors of the professional staffing market with distinct business models attuned to those sectors. Businesses in the Apex Segment predominately serve markets with a large and local talent pool, and provide a full range of skills through a network of local offices where clients most value relationship, speed, reliability and price. The Apex Segment provides a broad spectrum of technical, scientific and creative professionals for contract, contract-to-hire and permanent placement positions to Fortune 1000 and mid-market clients across the United States. Our businesses in this segment include Apex Systems, Lab Support and Creative Circle. Businesses in the Oxford Segment predominately serve markets with higher-end, specialized skills through a combination of national recruiting centers and local offices where clients most value the unique skill of the candidate and speed of response. The Oxford Segment provides specialized, niche staffing and consulting services in select skill and geographic markets. Our businesses in this segment include Oxford, CyberCoders and Life Sciences Europe.

Effective January 1, 2016, there were two changes to the Company's segment configuration: 1) the Apex Segment now includes a small clinical research business which was previously included in the Oxford Segment, and 2) costs associated with personnel located at our Corporate office that have shared services roles and support certain of our businesses, primarily within the Oxford Segment, are now presented in the segments they support whereas previously they were presented within Corporate. For comparability purposes, prior periods have been adjusted to reflect these changes.

The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit and operating income. The information in the following tables is derived directly from the segments’ internal financial reporting used for corporate management purposes. The Company's management does not evaluate, manage or measure performance of segments using asset information, and such information is not readily available. Accordingly, assets by reportable segment are not disclosed.

The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):

	Three Months Ended
	March 31, 2016
	Apex		Oxford		Corporate(1)			Total
Revenues	$	433,155	$	148,885	$	—		$	582,040
Gross profit	126,144		61,638		—			187,782
Operating income	39,986		12,760		(14,989		)	37,757
Amortization	8,590		1,554		—			10,144

	Three Months Ended
	March 31, 2015
	Apex		Oxford (2)		Corporate(1)			Total
Revenues	$	295,971	$	134,074	$	—		$	430,045
Gross profit	80,152		55,723		—			135,875
Operating income	22,896		12,713		(10,538		)	25,071
Amortization	3,522		1,347		—			4,869

(1) Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses, and depreciation expense for corporate assets.

(2) During the quarter ended June 30, 2015, due to management changes, the Company realigned its former Life Sciences Europe Segment to be included in the Oxford Segment. Prior periods have been adjusted to reflect this change.

The following table presents revenues by type (in thousands):

	Three Months Ended
	March 31,
	2016		%		2015		%
Revenues:
Assignment	$	549,552	94.4	%	$	406,141	94.4	%
Permanent placement	32,488		5.6	%	23,904		5.6	%
	$	582,040	100.0	%	$	430,045	100.0	%

The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table presents revenues by geographic location (in thousands):

	Three Months Ended
	March 31,
	2016		%		2015		%
Revenues:
Domestic	$	554,438	95.3	%	$	410,756	95.5	%
Foreign	27,602		4.7	%	19,289		4.5	%
	$	582,040	100.0	%	$	430,045	100.0	%

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Acquisitions Acquisitions (Policies)

3 Months Ended

Mar. 31, 2016

Acquisitions [Abstract]

Acquisition [Policy Text Block]

Assets and liabilities of the acquired companies were recorded at their estimated fair values at the dates of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill. The fair value assigned to identifiable intangible assets was determined primarily by using a discounted cash flow method.

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Fair Value Measurements (Policies)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments, Policy [Policy Text Block]

The recorded values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value based on their short-term nature. Long-term debt recorded in theCompany’s condensed consolidated balance sheet atMarch 31, 2016was$723.2 million (net of $17.8 million of unamortized deferred loan costs, see "Note 6. Long-Term Debt"). The fair value of the long-term debt at that same date was$744.5 million as determined using the quoted price technique, based on Level 2 inputs (significant observable inputs other than quoted prices for identical assets in active markets) from the fair value hierarchy, and included the yields of comparable companies with similar credit characteristics.

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Acquisitions Acquisitions (Tables)

3 Months Ended

Mar. 31, 2016

Acquisitions [Abstract]

ScheduleOfPurchasePriceAllocationTableTextBlock [Table Text Block]

The Company's allocation of the purchase price of Creative Circle and LabResource has been finalized and the following table summarizes the allocations (in thousands):

	Creative Circle		LabResource
Cash	$	4,840	$	187
Accounts receivable	34,386		1,643
Prepaid expenses and other current assets	4,462		—
Property and equipment	5,077		12
Goodwill	358,029		6,449
Identifiable intangible assets	194,500		7,528
Other	651		—
Total assets acquired	$	601,945	$	15,819
Current liabilities	$	12,254	$	1,482
Other	—		1,882
Total liabilities assumed	12,254		3,364
Total purchase price (1) (2)	$	589,691	$	12,455

(1) Excluding cash acquired and a $0.9 million adjustment for net working capital in excess of the targeted amount (thereby increasing the actual purchase price paid), the purchase price for Creative Circle was $584.0 million as described in the discussion above.

(2) Excluding cash acquired and a $0.4 million adjustment for net working capital that was less than the targeted amount (thereby reducing the actual purchase price paid), the purchase price for LabResource was $12.7 million as described in the discussion above.

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions:

		Identifiable Intangible Asset Value
	Useful life	Creative Circle		LabResource
Contractor relationships	2 - 4 years	$	29,500	$	947
Customer relationships	2 - 10 years	90,700		5,421
Non-compete agreements	2 - 6 years	7,300		20
Favorable contracts	5 years	900		—
Trademarks	indefinite	66,100		1,140
Total identifiable intangible assets acquired		$	194,500	$	7,528

Business Acquisition, Pro Forma Information [Table Text Block]

The summary below (in thousands, except for per share data) presents pro forma unaudited consolidated results of operations for the three months ended March 31, 2015 as if the acquisitions of Creative Circle and LabResource occurred on January 1, 2014. The pro forma financial information gives effect to certain adjustments, including amortization of intangible assets, interest expense on acquisition-related debt, provision for income taxes, and increased number of common shares as a result of the acquisitions. Acquisition-related costs are assumed to have occurred at the beginning of the year prior to acquisition. The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisitions had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.

Revenues	$	494,708
Income from continuing operations	$	13,955
Net income	$	40,067
Basic earnings per share:
Income from continuing operations	$	0.27
Net income	$	0.77
Diluted earnings per share:
Income from continuing operations	$	0.26
Net income	$	0.76
Number of shares and share equivalents used to calculate earnings per share:
Basic	52,314
Diluted	53,046

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Discontinued Operations (Tables)

3 Months Ended

Mar. 31, 2016

Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]

The cash flows that are attributable to the Physician Segment are as follows (in thousands):

	Three Months Ended
	March 31,
	2016		2015
Net cash provided by (used in) operating activities	$	53	$	(1,778	)
Net cash provided by investing activities:
Cash received from sale of discontinued operations, net	$	6,000	$	114,884
Other	—		(14		)
Total cash provided by investing activities	$	6,000	$	114,870

The following is a summary of the operating results of all of the Company's discontinued operations (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Revenues	$	—		$	12,068
Costs of services	—			8,653
Gross profit	—			3,415
Selling, general and administrative expenses	(85		)	2,641
Amortization of intangible assets	—			155
Income before income taxes	85			619
Provision for income taxes	32			210
Income from discontinued operations, net of income taxes	$	53		$	409

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Goodwill and Identifiable Assets (Tables)

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill for the year ended December 31, 2015 and the three months endedMarch 31, 2016 are as follows (in thousands):

	Apex Segment			Oxford Segment			Total
Balance as of December 31, 2014	$	287,951		$	224,109		$	512,060
Creative Circle Acquisition	358,029			—			358,029
LabResource Acquisition	—			6,449			6,449
Translation adjustment	(1,363		)	(269		)	(1,632		)
Balance as of December 31, 2015	644,617			230,289			874,906
Translation adjustment	355			396			751
Balance as of March 31, 2016	$	644,972		$	230,685		$	875,657

Schedule of Acquired Intangible Assets

Acquired intangible assets consisted of the following (in thousands):

		As of March 31, 2016						As of December 31, 2015
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Subject to amortization:
Customer relationships	2 - 10 years	$	196,780	$	80,781	$	115,999	$	196,472	$	74,640	$	121,832
Contractor relationships	2 - 5 years	69,813		42,991		26,822		69,764		40,124		29,640
Non-compete agreements	2 - 7 years	10,889		3,626		7,263		10,874		3,163		7,711
In-use software	6 years	18,900		7,304		11,596		18,900		6,516		12,384
Favorable contracts	5 years	900		242		658		900		172		728
		297,282		134,944		162,338		296,910		124,615		172,295
Not subject to amortization:
Trademarks		245,761		—		245,761		245,630		—		245,630
Total		$	543,043	$	134,944	$	408,099	$	542,540	$	124,615	$	417,925

Schedule of Estimated Future Amortization Expense

Estimated amortization expense for the remainder of this year, each of the next four years, and thereafter is as follows (in thousands): 

2016	$	29,515
2017	33,054
2018	28,928
2019	22,016
2020	14,515
Thereafter	34,310
	$	162,338

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Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consisted of the following (in thousands):

	March 31, 2016			December 31, 2015
$150 million revolving credit facility, due June 2020	$	34,000		$	50,000
$825 million Term B loan facility, due June 2022	707,000			724,000
	741,000			774,000
Unamortized deferred loan costs	(17,781		)	(18,492		)
	$	723,219		$	755,508

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs

The following table summarizes the balance of the contingent consideration and changes for the periods presented (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Balance at beginning of period	$	(20,981	)	$	(3,000	)
Additions for acquisitions	—			—
Payments on contingent consideration	—			—
Fair value adjustment	(613		)	—
Foreign currency translation adjustment	—			—
Balance at end of period	$	(21,594	)	$	(3,000	)

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Earnings per share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Reconciliation of Shares Used to Compute Basic and Diluted Earnings per Share

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2016	2015
Weighted average number of common shares outstanding used to compute basic earnings per share	53,147	51,519
Dilutive effect of stock-based awards	497	690
Number of shares used to compute diluted earnings per share	53,644	52,209

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

	Three Months Ended
	March 31, 2016
	Apex		Oxford		Corporate(1)			Total
Revenues	$	433,155	$	148,885	$	—		$	582,040
Gross profit	126,144		61,638		—			187,782
Operating income	39,986		12,760		(14,989		)	37,757
Amortization	8,590		1,554		—			10,144

	Three Months Ended
	March 31, 2015
	Apex		Oxford (2)		Corporate(1)			Total
Revenues	$	295,971	$	134,074	$	—		$	430,045
Gross profit	80,152		55,723		—			135,875
Operating income	22,896		12,713		(10,538		)	25,071
Amortization	3,522		1,347		—			4,869

(1) Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses, and depreciation expense for corporate assets.

(2) During the quarter ended June 30, 2015, due to management changes, the Company realigned its former Life Sciences Europe Segment to be included in the Oxford Segment. Prior periods have been adjusted to reflect this change.

Revenue by Type [Table Text Block]

The following table presents revenues by type (in thousands):

	Three Months Ended
	March 31,
	2016		%		2015		%
Revenues:
Assignment	$	549,552	94.4	%	$	406,141	94.4	%
Permanent placement	32,488		5.6	%	23,904		5.6	%
	$	582,040	100.0	%	$	430,045	100.0	%

Schedule of Revenue by Geographical Areas

The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table presents revenues by geographic location (in thousands):

	Three Months Ended
	March 31,
	2016		%		2015		%
Revenues:
Domestic	$	554,438	95.3	%	$	410,756	95.5	%
Foreign	27,602		4.7	%	19,289		4.5	%
	$	582,040	100.0	%	$	430,045	100.0	%

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Acquisitions Acquisitions Costs, by Acquisition (Details) - USD ($) $ in Thousands			6 Months Ended	12 Months Ended
	Jun. 05, 2015	Apr. 14, 2015	Jun. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
BusinessCombinationRecognizedGoodwill	$ 358,000
Creative Circle [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jun. 05, 2015
Business Acquisition, Name of Acquired Entity	Creative Circle, LLC
Business Acquisition, Description of Acquired Entity	is headquartered in Los Angeles, California
Business Combination, Reason for Business Combination	was purchased to expand the Company’s technical and creative staffing services
Payments to Acquire Businesses, Gross	$ 540,000
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	30,200
Stock Issued During Period, Shares, Acquisitions			794,700
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out	13,800
BusinessCombinationRecognizedGoodwill	358,029
Business Combination, Acquisition Related Costs				$ 5,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	194,500
LabResource [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Apr. 14, 2015
Business Acquisition, Name of Acquired Entity		LabResource B.V.
Business Acquisition, Description of Acquired Entity		headquartered in Amsterdam, Netherlands
Business Combination, Reason for Business Combination		expand the Company's life sciences staffing business in Europe
Payments to Acquire Businesses, Gross		$ 12,700
BusinessCombinationRecognizedGoodwill		6,449
Business Combination, Acquisition Related Costs				$ 400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		7,528
Contractor Relations [Member] | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	29,500
Contractor Relations [Member] | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		947
Customer relations | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	90,700
Customer relations | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		5,421
Non-compete agreements | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	7,300
Non-compete agreements | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		20
Contract-Based Intangible Assets [Member] | Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 900
Contract-Based Intangible Assets [Member] | LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 0

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Acquisitions Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 05, 2015	Apr. 14, 2015
Business Acquisition [Line Items]
BusinessCombinationRecognizedGoodwill	$ 358,000
Creative Circle [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 4,840
Business Combination, Acquired Receivables, Description	34386
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	$ 4,462
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	5,077
BusinessCombinationRecognizedGoodwill	358,029
Business Combination, Goodwill Recognized, Description	194,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	651
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	601,945
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	12,254
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	12,254
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 589,691
LabResource [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 187
Business Combination, Acquired Receivables, Description		1643
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		$ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		12
BusinessCombinationRecognizedGoodwill		6,449
Business Combination, Goodwill Recognized, Description		7,528
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		15,819
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities		1,482
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		1,882
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		3,364
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 12,455

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Acquisitions Schedule of Intangible Assets Acquired as Part of Business Combination (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Jun. 05, 2015	Apr. 14, 2015
Creative Circle [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 194,500
Creative Circle [Member] | Trademarks [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		66,100
Creative Circle [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		29,500
Creative Circle [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		90,700
Creative Circle [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		7,300
Creative Circle [Member] | Contract-Based Intangible Assets [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 900
LabResource [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 7,528
LabResource [Member] | Trademarks [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			1,140
LabResource [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			947
LabResource [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			5,421
LabResource [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			20
LabResource [Member] | Contract-Based Intangible Assets [Member]
Acquired Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 0
Minimum [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	2 years
Minimum [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	2 years
Minimum [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	2 years
Minimum [Member] | Contract-Based Intangible Assets [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	5 years
Minimum [Member] | Computer Software, Intangible Asset [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	6 years
Maximum [Member] | Contractor Relations [Member]
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	4 years
Maximum [Member] | Customer relations
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	10 years
Maximum [Member] | Non-compete agreements
Acquired Intangible Assets [Line Items]
Acquired Finite Lived Intangible Assets Average Useful Life	6 years

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Acquisitions Business Acquisition, Pro Forma Information (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($) $ / shares shares
Acquired Indefinite-lived Intangible Assets [Line Items]
Business Acquisition, Pro Forma Revenue | $	$ 494,708
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax | $	13,955
Business Acquisition, Pro Forma Net Income (Loss) | $	$ 40,067
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic	$ 0.27
Business Acquisition, Pro Forma Earnings Per Share, Basic	0.77
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	0.26
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.76
Weighted Average Basic Shares Outstanding, Pro Forma | shares	52,314
Pro Forma Weighted Average Shares Outstanding, Diluted | shares	53,046

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Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 02, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of income taxes		$ 53	$ 409
Proceeds from Divestiture of Businesses	$ 123,000
Gain (Loss) on Disposition of Business		0	25,703
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation			14,400
Cash Provided by (Used in) Operating Activities, Discontinued Operations		53	(1,778)
Cash received from sale of discontinued operations, net		6,000	114,884
Other Cash Provided by (Used in) Investing Activities, Discontinued Operations		0	14
Cash Provided by (Used in) Investing Activities, Discontinued Operations		6,000	114,870
Disposal Group, Including Discontinued Operation, Revenue		0	12,068
Disposal Group Including Discontinued Operations Cost of Services		0	8,653
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)		0	3,415
Disposal Group, Including Discontinued Operation, General and Administrative Expense		85	2,641
Disposal Group Including Discontinued Operations Amortization of Intangible Assets		0	155
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		85	619
Discontinued Operation, Tax Effect of Discontinued Operation		$ 32	$ 210

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Goodwill and Identifiable Assets (Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Gross goodwill	$ 875,657	$ 874,906	$ 512,060
Goodwill	875,657	874,906
Translation adjustment	751	(1,632)
Apex
Goodwill [Roll Forward]
Gross goodwill	644,972	644,617	287,951
Translation adjustment	355	(1,363)
Oxford
Goodwill [Roll Forward]
Gross goodwill	230,685	230,289	$ 224,109
Translation adjustment	$ 396	(269)
Creative Circle [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		358,029
Creative Circle [Member] | Apex
Goodwill [Roll Forward]
Goodwill, Acquired During Period		358,029
Creative Circle [Member] | Oxford
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
LabResource [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		6,449
LabResource [Member] | Apex
Goodwill [Roll Forward]
Goodwill, Acquired During Period		0
LabResource [Member] | Oxford
Goodwill [Roll Forward]
Goodwill, Acquired During Period		$ 6,449

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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Intangible Assets [Line Items]
Amortization of intangible assets	$ 10,144	$ 4,869
Intangible assets subject to amortization:
Gross Carrying Amount	297,282		$ 296,910
Accumulated Amortization	134,944		124,615
Net Carrying Amount	162,338		172,295
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	245,761		245,630
Goodwill, Carrying Amount	875,657		874,906
Intangible Assets, Gross (Excluding Goodwill)	543,043		542,540
Total
Identifiable intangible assets, net	408,099		417,925
Customer relations
Intangible assets subject to amortization:
Gross Carrying Amount	196,780		196,472
Accumulated Amortization	80,781		74,640
Net Carrying Amount	$ 115,999		121,832
Customer relations | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Customer relations | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	10 years
Contractor Relations [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	$ 69,813		69,764
Accumulated Amortization	42,991		40,124
Net Carrying Amount	$ 26,822		29,640
Contractor Relations [Member] | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Contractor Relations [Member] | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	5 years
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	$ 10,889		10,874
Accumulated Amortization	3,626		3,163
Net Carrying Amount	$ 7,263		7,711
Non-compete agreements | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Non-compete agreements | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	7 years
Computer Software, Intangible Asset [Member]
Intangible Assets [Line Items]
Estimated Useful Life	5 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 18,900		18,900
Accumulated Amortization	7,304		6,516
Net Carrying Amount	$ 11,596		12,384
Contract-Based Intangible Assets [Member]
Intangible Assets [Line Items]
Estimated Useful Life	6 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 900		900
Accumulated Amortization	242		172
Net Carrying Amount	$ 658		$ 728

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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 10,144	$ 4,869
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2016	29,515
2017	33,054
2018	28,928
2019	22,016
2020	14,515
Thereafter	34,310
Net Carrying Amount	$ 162,338		$ 172,295

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Long-Term Debt Long-Term Debt Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Secured Debt	$ 741,000	$ 774,000
Unamortized Debt Issuance Expense	(17,781)	(18,500)
Long-term Debt	723,219	755,508
$150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Secured Debt	34,000	50,000
$825 Million Term B Loan Facility, due June 2022 [Member]
Debt Instrument [Line Items]
Secured Debt	$ 707,000	$ 724,000

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Long-Term Debt Long-term Debt text (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 15, 2015 Rate	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 05, 2015 USD ($)
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		$ (17,781)	$ (18,500)
Debt, Weighted Average Interest Rate		3.71%
Contractual Quarterly Payments		$ 2,100
Payments on Debt		$ 134,000
Leverage Ratio		2.80
$825 Million Term B Loan Facility and $150 Million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 975,000
$825 Million Term B Loan Facility, due June 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				825,000
$150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 150,000
Maximum [Member]
Debt Instrument [Line Items]
Leverage Ratio		4.25
Leverage Ratio in Latest Year of Debt Term		3.25
Notes Payable to Banks [Member] | Minimum [Member] | $150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate	0.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate	0.25%
Notes Payable to Banks [Member] | Maximum [Member] | $150 Million Revolving Credit Facility, Due June 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate	2.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate	0.40%
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $825 Million Term B Loan Facility, due June 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate	3.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		$ 112,500

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Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Other Commitments [Line Items]
Costs and Expenses, Related Party	$ 300	$ 300
Number of Leased Properties Owned by Related Parties | property	2
Self Insurance Reserve	$ 1,600		$ 1,800
Workerscompensationreceivable	13,278		13,238
Letters of Credit Outstanding, Amount	$ 3,500		$ 3,500

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Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information
Long-term Debt	$ 723,219	$ 755,508
Unamortized Debt Issuance Expense	(17,781)	(18,500)
Level 2 Inputs
Fair Value Inputs, Liabilities, Quantitative Information
Long-term debt, fair value	744,500
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Liabilities, Quantitative Information
Obligations, Fair Value Disclosure	$ (21,600)	$ (21,000)

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Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Contingent consideration for acquisitions
Balance at beginning of period	$ (20,981)	$ (3,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	613	0
Foreign currency translation adjustment	0	0
Balance at end of period	$ (21,594)	$ (3,000)

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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income [Abstract]
Accumulated other comprehensive loss	$ (6,819)		$ (8,162)
Foreign currency translation adjustment	1,343	$ (3,724)
Changes in fair value of derivative, net of tax	$ 0	$ 47

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Stock-based compensation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments
Allocated Share-based Compensation Expense	$ 6.9	$ 4.0
2010 Employee Stock Purchase Plan (ESPP)
Deferred Compensation Arrangement with Individual, Share-based Payments
Employee stock purchase plan shares issued during period	128,518

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Earnings per share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	473,000
Weighted Average Number of Shares Outstanding Reconciliation
Weighted average number of common shares outstanding used to compute basic earnings per share	53,147,000	51,519,000
Dilutive effect of stock-based awards	497,000	690,000
Number of shares used to compute diluted earnings per share	53,644,000	52,209,000

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Segment Reporting (Segment Reporting Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
Revenues:
Revenues	$ 582,040	$ 430,045
Revenue as Percentage of Consolidated Revenue	100.00%	100.00%
Gross Profit:
Total Gross Profit	$ 187,782	$ 135,875
Operating Income (Loss):
Total Operating Income	37,757	25,071
Amortization of Intangible Assets	$ 10,144	4,869
Reportable segments (in number of segments) | segment	2
Apex
Revenues:
Revenues	$ 433,155	295,971
Gross Profit:
Total Gross Profit	126,144	80,152
Operating Income (Loss):
Total Operating Income	39,986	22,896
Amortization of Intangible Assets	8,590	3,522
Oxford
Revenues:
Revenues	148,885	134,074
Gross Profit:
Total Gross Profit	61,638	55,723
Operating Income (Loss):
Total Operating Income	12,760	12,713
Amortization of Intangible Assets	1,554	1,347
Corporate Segment [Member]
Operating Income (Loss):
Total Operating Income	(14,989)	(10,538)
Amortization of Intangible Assets	0	0
Assignment [Member]
Revenues:
Revenues	$ 549,552	$ 406,141
Revenue as Percentage of Consolidated Revenue	94.40%	94.40%
PermanentPlacement [Member]
Revenues:
Revenues	$ 32,488	$ 23,904
Revenue as Percentage of Consolidated Revenue	5.60%	5.60%

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Segment Reporting (Revenue by Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues from External Customers [Line Items]
Revenues	$ 582,040	$ 430,045
Revenue as Percentage of Consolidated Revenue	100.00%	100.00%
Domestic [Member]
Revenues from External Customers [Line Items]
Revenues	$ 554,438	$ 410,756
Revenue as Percentage of Consolidated Revenue	95.30%	95.50%
Foreign [Member]
Revenues from External Customers [Line Items]
Revenues	$ 27,602	$ 19,289
Revenue as Percentage of Consolidated Revenue	4.70%	4.50%