Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
Net income	$ 5,406	$ 4,066
Adjustments to reconcile net income to net cash used in operations:
Depreciation	1,192	1,081
Amortization	3,365	3,801
Deferred income taxes	651	(450)
Non-cash stock compensation and retirement savings plan contributions	3,523	3,348
Tax benefit from stock option exercises and restricted stock vesting	0	(418)
Adjustment to fair value of contingent consideration	238	85
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	3,727	19,815
Other assets	1,044	(213)
Accounts payable	(6,057)	(11,129)
Other liabilities	(8,653)	(11,620)
Net cash provided by operating activities	4,436	8,366
INVESTING ACTIVITIES
Purchase of property and equipment	(1,044)	(530)
Capitalization of internally developed software costs	(662)	(335)
Purchase of business, net of cash acquired	(277)	(22,340)
Net cash used in investing activities	(1,983)	(23,205)
FINANCING ACTIVITIES
Proceeds from line of credit	59,000	84,000
Payments on line of credit	(59,000)	(70,500)
Payment of credit facility financing fees	0	(193)
Tax benefit on stock option exercises and restricted stock vesting	0	418
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	53	169
Purchases of treasury stock	0	(1,367)
Remittance of taxes withheld as part of a net share settlement of restricted stock vesting	(2,351)	(2,310)
Net cash (used in) provided by financing activities	(2,298)	10,217
Effect of exchange rate on cash and cash equivalents	50	40
Change in cash and cash equivalents	205	(4,582)
Cash and cash equivalents at beginning of period	8,811	10,935
Cash and cash equivalents at end of period	9,016	6,353
Supplemental disclosures:
Cash paid for income taxes	593	514
Cash paid for interest	373	202
Non-cash activity:
Stock issued for purchase of businesses	0	11,412
Estimated fair value of contingent consideration for purchase of business	$ 0	$ 2,240

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fair value of stock issued in noncash financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

+ Details

Name:	us-gaap_StockIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration