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, 2015

or

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

For the transition period from              to             

Commission File No. 000-49604

__________________________________________

ManTech International Corporation

(Exact name of registrant as specified in its charter)

__________________________________________

Delaware	22-1852179
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
12015 Lee Jackson Highway, Fairfax, VA	22033
(Address of principal executive offices)	(Zip Code)

(703) 218-6000

(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.    x  Yes    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).    x  Yes    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 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  (Do not check if a smaller reporting company)	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

As of April 29, 2015 there were 24,331,289 shares outstanding of our Class A common stock and 13,192,845 shares outstanding of our Class B common stock.

MANTECH INTERNATIONAL CORPORATION

FORM 10-Q

FOR THE QUARTER ENDED March 31, 2015

INDEX

		Page No.
PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited)
	Condensed Consolidated Balance Sheets as of March 31, 2015 and December 31, 2014	3
	Condensed Consolidated Statements of Income for the Three Months Ended March 31, 2015 and 2014	4
	Condensed Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2015 and 2014	5
	Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2015 and 2014	6
	Notes to Condensed Consolidated Financial Statements	7
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	23
Item 4.	Controls and Procedures	24
Part II - OTHER INFORMATION
Item 1.	Legal Proceedings	25
Item 1A.	Risk Factors	25
Item 6.	Exhibits	25

2

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

MANTECH INTERNATIONAL CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(In Thousands Except Share Amounts)

	(unaudited)
	March 31, 2015			December 31, 2014
ASSETS
Cash and cash equivalents	$	43,628		$	23,781
Receivables—net	358,366			377,156
Prepaid expenses and other	18,492			18,207
Total Current Assets	420,486			419,144
Goodwill	851,640			851,640
Other intangible assets—net	150,365			155,250
Employee supplemental savings plan assets	32,386			31,741
Property and equipment—net	25,259			25,743
Other assets	3,910			3,884
TOTAL ASSETS	$	1,484,046		$	1,487,402
LIABILITIES AND STOCKHOLDERS' EQUITY
LIABILITIES
Accounts payable and accrued expenses	$	122,996		$	149,506
Accrued salaries and related expenses	66,227			57,409
Billings in excess of revenue earned	17,873			13,408
Deferred income taxes—current	3,232			3,330
Total Current Liabilities	210,328			223,653
Deferred income taxes—non-current	69,774			65,103
Accrued retirement	30,261			32,804
Other long-term liabilities	11,162			11,063
TOTAL LIABILITIES	321,525			332,623
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, Class A—$0.01 par value; 150,000,000 shares authorized; 24,575,402 and 24,423,514 shares issued at March 31, 2015 and December 31, 2014; 24,331,289 and 24,179,401 shares outstanding at March 31, 2015 and December 31, 2014	246			244
Common stock, Class B—$0.01 par value; 50,000,000 shares authorized; 13,192,845 and 13,192,845 shares issued and outstanding at March 31, 2015 and December 31, 2014	132			132
Additional paid-in capital	432,762			428,895
Treasury stock, 244,113 and 244,113 shares at cost at March 31, 2015 and December 31, 2014	(9,158		)	(9,158		)
Retained earnings	738,771			734,873
Accumulated other comprehensive loss	(232		)	(207		)
TOTAL STOCKHOLDERS’ EQUITY	1,162,521			1,154,779
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	1,484,046		$	1,487,402

See notes to condensed consolidated financial statements.

3

MANTECH INTERNATIONAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In Thousands Except Per Share Amounts)

	(unaudited) Three months ended March 31,
	2015			2014
REVENUES	$	370,330		$	452,033
Cost of services	314,149			393,009
General and administrative expenses	36,335			38,982
OPERATING INCOME	19,846			20,042
Interest expense	(275		)	(4,119		)
Interest income	67			177
Other income (expense), net	(141		)	(41		)
INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS	19,497			16,059
Provision for income taxes	(7,739		)	(6,368		)
Equity in losses of unconsolidated subsidiaries	—			(57		)
NET INCOME	$	11,758		$	9,634
BASIC EARNINGS PER SHARE:
Class A common stock	$	0.31		$	0.26
Class B common stock	$	0.31		$	0.26
DILUTED EARNINGS PER SHARE:
Class A common stock	$	0.31		$	0.26
Class B common stock	$	0.31		$	0.26

See notes to condensed consolidated financial statements.

4

MANTECH INTERNATIONAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In Thousands)

	(unaudited) Three months ended March 31,
	2015			2014
NET INCOME	$	11,758		$	9,634
OTHER COMPREHENSIVE LOSS:
Translation adjustments, net of tax	(25		)	(13		)
COMPREHENSIVE INCOME	$	11,733		$	9,621

See notes to condensed consolidated financial statements.

5

MANTECH INTERNATIONAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In Thousands)

	(unaudited) Three months ended March 31,
	2015			2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	11,758		$	9,634
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,178			7,592
Deferred income taxes	2,966			2,825
Stock-based compensation	1,210			1,226
Excess tax benefits from exercise of stock options	(58		)	(10		)
Equity in losses of unconsolidated subsidiaries	—			57
Change in assets and liabilities—net of effects from acquired businesses:
Receivables—net	18,790			77,448
Prepaid expenses and other	(298		)	2,423
Contractual inventory	—			3,717
Accounts payable and accrued expenses	(25,698		)	(46,987		)
Accrued salaries and related expenses	8,818			7,622
Billings in excess of revenue earned	4,465			(440		)
Accrued retirement	(2,543		)	(2,460		)
Other	(738		)	(393		)
Net cash flow from operating activities	25,850			62,254
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,572		)	(909		)
Investment in unconsolidated subsidiaries	(750		)	(21		)
Investment in capitalized software for internal use	(96		)	(2,603		)
Proceeds from sale of investment	13			—
Acquisition of businesses—net of cash acquired	—			(44,927		)
Net cash flow from investing activities	(2,405		)	(48,460		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(7,856		)	(7,809		)
Proceeds from exercise of stock options	4,200			633
Borrowings under revolving credit facility	1,500			—
Repayments under revolving credit facility	(1,500		)	—
Excess tax benefits from exercise of stock options	58			10
Net cash flow from financing activities	(3,598		)	(7,166		)
NET CHANGE IN CASH AND CASH EQUIVALENTS	19,847			6,628
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	23,781			269,001
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	43,628		$	275,629
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	$	252		$	313
Cash paid for income taxes	$	80		$	610

See notes to condensed consolidated financial statements.

6

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2015

UNAUDITED

1. Description of the Business

ManTech International Corporation (depending on the circumstances, “ManTech,” “Company,” “we,” “our,” “ours” or “us”) is a leading provider of innovative technologies and solutions for mission-critical national security programs for the intelligence community; the departments of Defense, State, Homeland Security, Health and Human Services, Veteran Affairs, and Justice, including the Federal Bureau of Investigation (FBI); the space communities; and other U.S. government customers. We provide support to critical national security programs for approximately 50 federal agencies through approximately 1,000 current contracts. Our expertise includes cyber; software and systems development; enterprise information technology; multi-discipline intelligence; program protection and mission assurance; systems engineering; test and evaluation (T&E); command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR); training; global logistics and supply chain management; and management consulting. We support major national missions, such as military readiness and wellness, terrorist threat detection, information security and border protection. Our employees operate primarily in the United States, as well as in numerous locations internationally.

2. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and note disclosures normally included in the annual financial statements, prepared in accordance with accounting principles generally accepted in the United States of America, have been condensed or omitted pursuant to those rules and regulations. We recommend that you read these unaudited condensed consolidated financial statements in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, previously filed with the SEC. We believe that the unaudited condensed consolidated financial statements in this Form 10-Q reflect all adjustments that are necessary to fairly present the financial position, results of operations and cash flows for the interim periods presented. The results of operations for such interim periods are not necessarily indicative of the results that can be expected for the full year.

3. Acquisitions

7Delta Inc.—On May 23, 2014, we completed the acquisition of all equity interests in 7Delta Inc. (7Delta). The results of 7Delta's operations have been included in our condensed consolidated financial statements since that date. The acquisition was completed through a stock purchase agreement dated May 23, 2014, by and among ManTech International Corporation, 7Delta, SLS Holdings, Inc. and the stockholders of SLS Holdings, Inc. 7Delta performs critical services such as applications and software development, program management, systems integration, information assurance and security architecture primarily within the healthcare community at the Department of Veteran Affairs (VA). We funded the acquisition through a combination of cash on hand and borrowings under our revolving credit facility. The stock purchase agreement did not contain provisions for contingent consideration.

During the three months ended March 31, 2014, we incurred approximately $0.2 million of acquisition costs related to the 7Delta transaction, which are included in the general and administrative expenses in our condensed consolidated statement of income.

The purchase price of $81.4 million was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. We recorded goodwill of $70.0 million, which will be deductible for tax purposes over 15 years, assuming adequate levels of taxable income. Recognition of goodwill is largely attributed to the value paid for 7Delta's capabilities in providing software development, program management, system integration, information assurance and security architecture to the VA.

In allocating the purchase price, we considered among other factors, analysis of historical financial performance and estimates of future performance of 7Delta's contracts. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $4.8 million and $2.9 million, respectively. Customer contracts and related relationships represent the underlying relationships and agreements with 7Delta's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 10 years. Backlog is amortized straight-line over its estimated useful life of 2 years. The weighted-average amortization period for the intangible assets is 7 years.

7

The following table represents purchase price allocation for 7Delta (in thousands):

	7Delta Inc.
Cash and cash equivalents	$	1,408
Receivables	9,664
Prepaid expenses and other	175
Goodwill	69,967
Other intangible assets	7,762
Property and equipment	597
Other assets	39
Accounts payable and accrued expenses	(6,617		)
Accrued salaries and related expenses	(1,399		)
Billings in excess of revenue earned	(229		)
Net assets acquired and liabilities assumed	$	81,367

We have not disclosed current period, nor pro forma, revenues and earnings attributable to 7Delta as our integration of these operations post-acquisition and the entity's accounting methods pre-acquisition make it impracticable.

Allied Technology Group, Inc.—On February 18, 2014, we completed the acquisition of all equity interests in Allied Technology Group, Inc. (ATG). The results of ATG's operations have been included in our condensed consolidated financial statements since that date. The acquisition was completed through a stock purchase agreement dated February 18, 2014, by and among ManTech Advanced Systems International, Inc., Allied Technology Group, Inc. and the stockholders of ATG. ATG is an innovative engineering and information management solution company with strong customer relationships and strategic contracts with the Department of Homeland Security (DHS). ATG provides IT, engineering services, program management and training solutions to a variety of federal customers. The acquisition is enabling us to deliver services through their unrestricted prime position on DHS's primary acquisition vehicles: Technical, Acquisition and Business Support Services and Enterprise Acquisition Gateway for Leading Edge Solutions II. We funded the acquisition with cash on hand. The stock purchase agreement did not contain provisions for contingent consideration.

During the three months ended March 31, 2014, we incurred approximately $0.2 million of acquisition costs related to the ATG transaction, which are included in the general and administrative expenses in our condensed consolidated statement of income.

The purchase price of $45.0 million was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. We recorded goodwill of $28.8 million, which will be deductible for tax purposes over 15 years, assuming adequate levels of taxable income. Recognition of goodwill is largely attributed to the value paid for ATG's capabilities in providing technology service program management, systems engineering and information technology services to DHS.

In allocating the purchase price, we considered among other factors, analysis of historical financial performance and estimates of future performance of ATG's contracts. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $6.4 million and $0.6 million, respectively. Customer contracts and related relationships represent the underlying relationships and agreements with ATG's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 20 years. Backlog is amortized straight-line over its estimated useful life of 1 year. The weighted-average amortization period for the intangible assets is 18 years.

8

The following table represents the purchase price allocation for ATG (in thousands):

	Allied Technology Group, Inc.
Cash and cash equivalents	$	712
Receivables	11,670
Prepaid expenses and other	1,432
Contractual inventory	1
Goodwill	28,806
Other intangible assets	7,071
Property and equipment	899
Other assets	111
Accounts payable and accrued expenses	(3,399		)
Accrued salaries and related expenses	(2,155		)
Billings in excess of revenue earned	(148		)
Net assets acquired and liabilities assumed	$	45,000

We have not disclosed current period, nor pro forma, revenues and earnings attributable to ATG as our integration of these operations post-acquisition and the entity's accounting methods pre-acquisition make it impracticable.

4. Earnings Per Share

Under ASC 260, Earnings per Share, the two-class method is an earnings allocation formula that determines earnings per share for each class of common stock according to dividends declared (or accumulated) and participation rights in undistributed earnings. Under that method, basic and diluted earnings per share data are presented for each class of common stock.

In applying the two-class method, we determined that undistributed earnings should be allocated equally on a per share basis between Class A and Class B common stock. Under our Certificate of Incorporation, the holders of the common stock are entitled to participate ratably, on a share-for-share basis as if all shares of common stock were of a single class, in such dividends as may be declared by the Board of Directors. During each of the three months endedMarch 31, 2015 and 2014, we declared and paid one quarterly dividend, in the amount of 0.21 per share, on both classes of common stock.

Basic earnings per share has been computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period. Shares issued during the period and shares reacquired during the period are weighted for the portion of the period in which the shares were outstanding. Diluted earnings per share has been computed in a manner consistent with that of basic earnings per share while giving effect to all potentially dilutive common shares that were outstanding during each period.

9

The net income available to common stockholders and weighted average number of common shares outstanding used to compute basic and diluted earnings per share for each class of common stock are as follows (in thousands, except per share amounts):

	Three months ended March 31,
	2015		2014
Distributed earnings	$	7,860	$	7,814
Undistributed earnings	3,898		1,820
Net income	$	11,758	$	9,634
Class A common stock:
Basic net income available to common stockholders	$	7,610	$	6,216
Basic weighted average common shares outstanding	24,206		23,988
Basic earnings per share	$	0.31	$	0.26
Diluted net income available to common stockholders	$	7,627	$	6,222
Effect of potential exercise of stock options	153		69
Diluted weighted average common shares outstanding	24,359		24,057
Diluted earnings per share	$	0.31	$	0.26
Class B common stock:
Basic net income available to common stockholders	$	4,148	$	3,418
Basic weighted average common shares outstanding	13,193		13,193
Basic earnings per share	$	0.31	$	0.26
Diluted net income available to common stockholders	$	4,131	$	3,412
Effect of potential exercise of stock options	—		—
Diluted weighted average common shares outstanding	13,193		13,193
Diluted earnings per share	$	0.31	$	0.26

For the three months endedMarch 31, 2015 and 2014, options to purchase 2.0 million and 2.8 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because the options’ effect would have been anti-dilutive. For the three months endedMarch 31, 2015 and 2014, shares issued from the exercise of stock options were 150,138 and 24,767, respectively.

5. Receivables

We deliver a broad array of information technology and technical services solutions under contracts with the U.S. government, state and local governments and commercial customers. The components of contract receivables are as follows (in thousands):

	March 31, 2015			December 31, 2014
Billed receivables	$	266,470		$	319,065
Unbilled receivables:
Amounts billable	78,616			50,393
Revenues recorded in excess of funding	15,693			13,082
Retainage	7,331			4,446
Allowance for doubtful accounts	(9,744		)	(9,830		)
Receivables—net	$	358,366		$	377,156

10

Amounts billable consist principally of amounts to be billed within the next month. Revenues recorded in excess of funding are billable upon receipt of contractual amendments or other modifications. The retainage is billable upon completion of contract performance and approval of final indirect expense rates by the government. The allowance for doubtful accounts represents our exposure to compliance and contractual issues as well as bad debt related to prime contractors.

Accounts receivable at March 31, 2015 are expected to be substantially collected within one year except for approximately $1.1 million, of which 90.6% is related to receivables from direct sales to the U.S. government. The remainder is related to receivables from contracts in which we acted as a subcontractor to other contractors. We do not believe that we have significant exposure to credit risk as accounts receivable and the related unbilled amounts are primarily due from the U.S. government.

6. Property and Equipment

Major classes of property and equipment are summarized as follows (in thousands):

	March 31, 2015			December 31, 2014
Furniture and equipment	$	44,215		$	43,659
Leasehold improvements	35,179			35,601
Property and equipment—gross	79,394			79,260
Accumulated depreciation and amortization	(54,135		)	(53,517		)
Property and equipment—net	$	25,259		$	25,743

7. Goodwill and Other Intangible Assets

There was no change in the carrying amount of goodwill during the three months ended March 31, 2015. The change in the carrying amount of goodwill during the year ended December 31, 2014 is as follows (in thousands):

	Goodwill Balance
Goodwill at December 31, 2013	$	752,867
Acquisitions	98,773
Goodwill at December 31, 2014	$	851,640

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

	March 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Other intangible assets:
Contract and program intangible assets	$	266,272	$	130,570	$	135,702	$	266,272	$	126,619	$	139,653
Capitalized software cost for internal use	35,032		20,428		14,604		35,036		19,500		15,536
Other	115		56		59		115		54		61
Total other intangible assets—net	$	301,419	$	151,054	$	150,365	$	301,423	$	146,173	$	155,250

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Amortization expense relating to intangible assets for both the three months endedMarch 31, 2015 and 2014 was $4.9 million. We estimate that we will have the following amortization expense for the future periods indicated below (in thousands):

For the remaining nine months ending December 31, 2015	$	15,018
For the year ending:
December 31, 2016	$	17,858
December 31, 2017	$	15,859
December 31, 2018	$	14,364
December 31, 2019	$	12,509
December 31, 2020	$	11,283

8. Debt

Revolving Credit Facility—We maintain a credit facility with a syndicate of lenders led by Bank of America, N.A, as sole administrative agent. The credit agreement provides for a $500 million revolving credit facility, with a $25 million letter of credit sublimit and a $30 million swing line loan sublimit. The credit agreement also includes an accordion feature that permits us to arrange with the lenders for the provision of additional commitments. On June 13, 2014, we amended and restated the credit agreement, and extended the maturity date to June 13, 2019.

Borrowings under our revolving credit facility are collateralized by substantially all the assets of ManTech and its Material Subsidiaries (as defined in the credit agreement) and bear interest at one of the following variable rates as selected by us at the time of borrowing: a London Interbank Offer Rate (LIBOR) base rate plus market-rate spreads (1.25% to 2.25% based on our consolidated total leverage ratio) or Bank of America's base rate plus market spreads (0.25% to 1.25% based on our consolidated total leverage ratio).

The terms of the credit agreement permit prepayment and termination of the loan commitments at any time, subject to certain conditions. The credit agreement requires us to comply with specified financial covenants, including the maintenance of certain leverage ratios and a certain consolidated coverage ratio. The credit agreement also contains various covenants, including affirmative covenants with respect to certain reporting requirements and maintenance of certain business activities, and negative covenants that, among other things, may limit or impose restrictions on our ability to incur liens, incur additional indebtedness, make investments, make acquisitions and undertake certain other actions. As of March 31, 2015, we were in compliance with the financial covenants under the credit agreement.

There was no outstanding balance on our revolving credit facility at both March 31, 2015 and December 31, 2014. The maximum available borrowing under our revolving credit facility at March 31, 2015 was $499.2 million. As of March 31, 2015, we were contingently liable under letters of credit totaling $0.8 million, which reduced our availability to borrow under our revolving credit facility.

9. Commitments and Contingencies

Contracts with the U.S. government, including subcontracts, are subject to extensive legal and regulatory requirements and, from time-to-time, agencies of the U.S. government, in the ordinary course of business, investigate whether our operations are conducted in accordance with these requirements and the terms of the relevant contracts. U.S. government investigations of us, whether related to our U.S. government contracts or conducted for other reasons, could result in administrative, civil, or criminal liabilities, including repayment, fines or penalties being imposed upon us, or could lead to suspension or debarment from future U.S. government contracting activities. Management believes it has adequately reserved for any losses that may be experienced from any investigation of which it is aware. The Defense Contract Audit Agency (DCAA) has completed our incurred cost audits through 2009, with no material adjustments. The remaining audits for 2010 through 2014 are not expected to have a material effect on our financial position, results of operations or cash flow and management believes it has adequately reserved for any losses.

In the normal course of business, we are involved in certain governmental and legal proceedings, claims and disputes and have litigation pending under several suits. We believe that the ultimate resolution of these matters will not have a material effect on our financial position, results of operations or cash flows.

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10. Stock-Based Compensation

Our 2011 Management Incentive Plan (the Plan) was designed to attract, retain and motivate key employees. Awards granted under the Plan are settled in shares of Class A common stock. At the beginning of each year, the Plan provides that the number of shares available for issuance automatically increases by an amount equal to 1.5% of the total number of shares of Class A and Class B common stock outstanding on December 31^st of the previous year. On January 2, 2015, there were 560,584 additional shares made available for issuance under the Plan. Through March 31, 2015, the remaining aggregate number of shares of our common stock authorized for issuance under the Plan was 4,702,660. Through March 31, 2015, there were 4,945,818 shares of our Class A common stock that were issued and remain outstanding as a result of equity awards granted under the Plan. The Plan expires in May 2021.

The Plan is administered by the compensation committee of our Board of Directors, along with its delegates. Subject to the express provisions of the Plan, the committee has the Board of Directors’ authority to administer and interpret the Plan, including the discretion to determine the exercise price, vesting schedule, contractual life and the number of shares to be issued.

We recorded $1.2 million of stock-based compensation expense for both of the three months endedMarch 31, 2015 and 2014. No compensation expense of employees with stock awards, including stock-based compensation expense, was capitalized during the periods. For the three months endedMarch 31, 2015 and 2014, the total recognized tax deficiency from the exercise of stock options, vested cancellations and the vesting of restricted stock was $1.5 million and $1.8 million, respectively.

Stock Options—Under the Plan, we have issued stock options. A stock option granted gives the holder the right, but not the obligation, to purchase a certain number of shares at a predetermined price for a specific period of time. During the three months endedMarch 31, 2015 and 2014, we issued options that vest over three years in equal annual installments beginning on the first anniversary of the date of grant and expire five years from the date of grant. Under the terms of the Plan, the contractual life of the option grants may not exceed eight years. The related compensation expense is recognized over the service period and is based on the grant date fair value of the stock and the number of shares expected to vest.

Fair Value Determination—We have used the Black-Scholes-Merton option pricing model to determine fair value of our awards on the date of grant. We will reconsider the use of the Black-Scholes-Merton model if additional information becomes available in the future that indicates another model would be more appropriate or if grants issued in future periods have characteristics that cannot be reasonably estimated under this model.

The following weighted-average assumptions were used for option grants during the three months endedMarch 31, 2015 and 2014:

Volatility—The expected volatility of the options granted was estimated based upon historical volatility of our share price through weekly observations of our trading history.

Expected Term—The expected term of options granted to employees during the three months endedMarch 31, 2015 and 2014 was determined from historical exercises of the grantee population. For all grants valued during the three months endedMarch 31, 2015 and 2014, the options had graded vesting over three years in equal annual installments beginning on the first anniversary of the date of grant and a contractual term of five years.

Risk-free Interest Rate—The yield on zero-coupon U.S. Treasury strips was used to extrapolate a forward-yield curve. This “term structure” of future interest rates was then input into a numeric model to provide the equivalent risk-free rate to be used in the Black-Scholes-Merton model based on the expected term of the underlying grants.

Dividend Yield—The Black-Scholes-Merton valuation model requires an expected dividend yield as an input. We have calculated our expected dividend yield based on an expected annual cash dividend of $0.84 per share.

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The following table summarizes weighted-average assumptions used in our calculations of fair value for the three months endedMarch 31, 2015 and 2014:

	Three months ended March 31,
	2015		2014
Volatility	27.16	%	29.86	%
Expected life of options	3 years		3 years
Risk-free interest rate	1.16	%	0.85	%
Dividend yield	3.00	%	3.00	%

Stock Option Activity—The weighted-average fair value of options granted during the three months endedMarch 31, 2015 and 2014, as determined under the Black-Scholes-Merton valuation model, was $5.04 and $4.89, respectively. Option grants that vested during the three months endedMarch 31, 2015 and 2014 had a combined fair value of $1.8 million and $2.6 million, respectively.

The following table summarizes stock option activity for the year ended December 31, 2014 and the three months endedMarch 31, 2015:

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Stock options at December 31, 2013	3,400,120		$	35.51	$	4,488
Granted	946,576		$	29.12
Exercised	(158,371	)	$	24.78	$	754
Cancelled and expired	(797,293	)	$	41.75
Stock options at December 31, 2014	3,391,032		$	32.76	$	4,722
Granted	107,340		$	32.53
Exercised	(150,138	)	$	27.66	$	830
Cancelled and expired	(340,449	)	$	46.02
Stock options at March 31, 2015	3,007,785		$	31.50	$	11,505

The following table summarizes non-vested stock options for the three months endedMarch 31, 2015:

	Number of Shares		Weighted Average Fair Value
Non-vested stock options at December 31, 2014	1,673,528		$	4.83
Granted	107,340		$	5.04
Vested	(346,520	)	$	5.07
Cancelled	(51,665	)	$	4.87
Non-vested stock options at March 31, 2015	1,382,683		$	4.78

The following table includes information concerning stock options exercisable and stock options expected to vest at March 31, 2015:

	Number of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Stock options exercisable	1,625,102	2 years	$	33.90	$	4,231
Stock options expected to vest	1,206,709	4 years	$	28.63	$	6,408
Stock options exercisable and expected to vest	2,831,811

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Unrecognized compensation expense related to outstanding stock options expected to vest as of March 31, 2015 was $5.1 million, which is expected to be recognized over a weighted-average period of 2 years and will be adjusted for any future changes in estimated forfeitures.

Restricted Stock—Under the Plan, we have issued restricted stock. A restricted stock award is an issuance of shares that cannot be sold or transferred by the recipient until the vesting period lapses. Restricted stock issued to members of our Board of Directors vests in one year. The related compensation expense is recognized over the service period and is based on the grant date fair value of the stock and the number of shares expected to vest.

Restricted Stock Activity—There was no restricted stock activity during the three months endedMarch 31, 2015. The following table summarizes the restricted stock activity during the year ended December 31, 2014:

	Number of Shares		Weighted Average Fair Value
Non-vested restricted stock at December 31, 2013	21,000
Granted	21,000		$	30.61
Vested	(21,000	)	$	27.65
Non-vested restricted stock at December 31, 2014	21,000

Restricted Stock Units—Under the Plan, we issued restricted stock units (RSUs). RSUs are not actual shares, but rather a right to receive shares in the future based on the level of achievement of performance criteria. The shares are not issued and the employee cannot sell or transfer shares prior to vesting and have no voting rights until the RSUs vest. Employees who are granted RSUs do not receive dividend payments during the service period. The employee’s RSUs will result in the delivery of shares if (a) performance criteria is met and (b) the employee remains employed, in good standing, through the date of the performance period. The performance period is 2 years (January 1, 2015 to December 31, 2016). The grant date fair value of the RSUs is equal to the closing market price of our common stock on the grant date less the present value of dividends expected to be awarded during the service period. We recognize the grant date fair value of RSUs of shares we expect to issue as compensation expense ratably over the requisite service period of March 1, 2015 to December 31, 2016.

Restricted Stock Unit Activity—The following table summarizes the nonvested restricted stock unit activity during the three months endedMarch 31, 2015:

	Number of Shares	Weighted Average Fair Value
Non-vested restricted stock units at December 31, 2014	—
Granted	103,900	$	30.92
Non-vested restricted stock units at March 31, 2015	103,900

11. Business Segment and Geographic Area Information

We have one reportable segment. We deliver a broad array of information technology and technical services solutions under contracts with the U.S. government. Our U.S. government customers typically exercise independent contracting authority, and even offices or divisions within an agency or department may directly, or through a prime contractor, use our services as a separate customer so long as that customer has independent decision-making and contracting authority within its organization. Revenues from the U.S. government under prime contracts and subcontracts were approximately 98.9% of our revenues for both of the three months endedMarch 31, 2015 and 2014. We treat sales to U.S. government customers as sales within the United States regardless of where the services are performed. U.S. revenues are approximately 99.9% and 99.7% of our total revenues for the three months endedMarch 31, 2015 and 2014, respectively. International revenues were approximately 0.1% and 0.3% of our total revenues for the three months endedMarch 31, 2015 and 2014, respectively. Furthermore, substantially all of our assets from continuing operations were held in the United States for the three months endedMarch 31, 2015 and year ended December 31, 2014.

12. Equity Method Investments

On May 24, 2012, Fluor-ManTech Logistics Solutions, LLC (FMLS), a limited liability company, was created with Fluor International, Inc. and ManTech as the investees. Each investee has a 50% ownership interest in FMLS. Because we have the ability to exercise significant influence over FMLS we determined that the equity method of accounting will be used for our investment. Under the operating agreement, we are required to provide additional financial support for losses incurred by FMLS.

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We recorded $0 and $57 thousand in equity method losses for the three months ended March 31, 2015 and 2014, respectively. We had no investment balance in FMLS as of March 31, 2015 and December 31, 2014. As of December 31, 2014, we recorded liabilities for $735 thousand, which were owed to FMLS for additional financial support and paid during the three months ended March 31, 2015.

On July 7, 2011, GenTech Partners Joint Venture (GenTech), was created with Genex Systems, LLC and ManTech as the investees. Genex Systems, LLC's interest is 51% and ManTech's interest in GenTech is 49%. Because we have the ability to exercise significant influence over GenTech, we determined that the equity method of accounting will be used for our investment. We recorded no equity method earnings for both the three months ended March 31, 2015 and 2014. Our investment balance in GenTech was $141 thousand as of March 31, 2015 and December 31, 2014.

13. Subsequent Event

Management has evaluated subsequent events after the balance sheet date through the financial statements issuance date for appropriate accounting and disclosure.

Acquisition of Welkin Associates, Ltd.

On April 27, 2015, we completed the acquisition of Welkin Associates, Ltd (Welkin), formerly a wholly-owned subsidiary of CSC. We funded the acquisition with cash on hand. Welkin delivers mission-centric services in high-end systems engineering and advanced national security technology and business services. The acquisition strategically positions us to pursue large engineering and support opportunities throughout the intelligence community and Department of Defense. The preliminary purchase price was $34.0 million.

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

Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements that involve substantial risks and uncertainties, many of which are outside of our control. ManTech International Corporation (depending on the circumstances, “ManTech,” “Company,” “we,” “our,” “ours” or “us”) believes these statements to be within the definition of the Private Securities Litigation Reform Act of 1995. You can identify these statements by forward-looking words such as “may,” “will,” “expect,” “intend,” “anticipate,” “believe,” “estimate,” “continue” and the negative of these terms or words of similar import. You should read statements that contain these words carefully because they discuss our future expectations, make projections of our future results of operations or financial condition or state other “forward-looking” information.

Although forward-looking statements in this Quarterly Report reflect our good faith judgment, such statements can only be based on facts and factors currently known by us. Consequently, forward-looking statements are inherently subject to risks and uncertainties, and actual results and outcomes may differ materially from the results and outcomes discussed in or anticipated by the forward-looking statements. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we are not able to predict accurately or control. Factors that could cause actual results to differ materially from the results we anticipate include, but are not limited to, the following:

• adverse changes or delays in U.S. government spending for programs we support due to cost cutting and efficiency initiatives, changing mission priorities or other federal budget constraints generally;

• uncertainty regarding the timing and nature of government action to complete the budget and appropriations process, continue U.S. government operations or address other budgetary constraints or other factors;

• failure to compete effectively for new contract awards or to retain existing U.S. government contracts;

• failure to obtain option awards, task orders or funding under contracts;

• failure to realize the full amount of our backlog or adverse changes in the timing of receipt of revenues under contracts included in backlog;

• delays in the competitive bidding process caused by competitors' protests of contract awards received by us or other factors;

• renegotiation, modification or termination of our contracts, or failure to perform in conformity with contract terms or our expectations;

• failure to successfully integrate acquired companies or businesses into our operations or to realize any accretive or synergistic effects from such acquisitions;

• failure to successfully identify and execute future acquisitions;

• adverse changes in business conditions that may cause our investments in recorded goodwill to become impaired;

• disruption of our business or damage to our reputation resulting from security breaches in customer systems, internal systems or service failures (including as a result of cyber or other security threats), or employee or subcontractor misconduct;

• non-compliance with, or adverse changes in, complex U.S. government procurement laws, regulations or processes;

• failure to maintain strong relationships with other contractors; and

• adverse results of U.S. government audits or other investigations of our government contracts.

We urge you not to place undue reliance on these forward-looking statements, which speak only as of the date of this Quarterly Report. These and other risk factors are more fully described and discussed in the section titled “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 and under Item 1A. of Part II of our Quarterly Reports on Form 10-Q, and from time-to-time, in our other filings with the Securities and Exchange Commission (SEC). We undertake no obligation

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to revise or update any forward-looking statements in order to reflect any event or circumstance that may arise after the date of this Quarterly Report, whether as a result of new information, subsequent events or circumstances, changes in expectations or otherwise. We also suggest that you carefully review and consider the various disclosures made in this Quarterly Report that attempt to advise interested parties of the risks and factors that may affect our business, financial condition, results of operations and prospects.

Introduction and Overview

ManTech is a leading provider of innovative technologies and solutions for mission-critical national security programs for the intelligence community; the departments of Defense, State, Homeland Security, Health and Human Services, Veterans Affairs and Justice, including the Federal Bureau of Investigations (FBI); the space communities; and other U.S. government customers.

We derive revenues primarily from contracts with U.S. government agencies that are focused on national security and consequently our operational results are affected by U.S. government spending levels in the areas of defense, intelligence and homeland security. Over the past few years, financial performance in our industry has been adversely impacted by public and political pressure regarding government funding levels, uncertainty about the appropriations process, and delays in contract awards and spending. In addition, as U.S. forces have withdrawn from Afghanistan, revenues from our contracts in support of Overseas Contingency Operations (OCO) have substantially declined. The delays in awards in 2014 and the first three months of 2015 have had continued impacts on our performance. While we expect an overall reduction in OCO work in 2015 as compared to 2014, we do expect the levels of work that existed in the first quarter of 2015 to remain relatively stable through the balance of the year. Despite uncertainties, we believe we are well positioned to meet our customers' needs and grow our business as we move beyond 2015.

We recommend that you read this discussion and analysis in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, previously filed with the SEC.

Three Months Ended March 31, 2015 Compared to the Three Months Ended March 31, 2014

The following table sets forth certain items from our condensed consolidated statements of income and the relative percentage that certain items of expenses and earnings bear to revenues, as well as the period-to-period change from March 31, 2014 to March 31, 2015.

	Three months ended March 31,										Period-to-Period Change
	2015			2014			2015		2014		2014 to 2015
	Dollars						Percentage				Dollars			Percentage
	(dollars in thousands)
REVENUES	$	370,330		$	452,033		100.0	%	100.0	%	$	(81,703	)	(18.1	)%
Cost of services	314,149			393,009			84.8	%	86.9	%	(78,860		)	(20.1	)%
General and administrative expenses	36,335			38,982			9.8	%	8.7	%	(2,647		)	(6.8	)%
OPERATING INCOME	19,846			20,042			5.4	%	4.4	%	(196		)	(1.0	)%
Interest expense	(275		)	(4,119		)	0.1	%	0.9	%	(3,844		)	(93.3	)%
Interest income	67			177			—	%	—	%	(110		)	(62.1	)%
Other income (expense), net	(141		)	(41		)	—	%	—	%	100			243.9	%
INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS	19,497			16,059			5.3	%	3.5	%	3,438			21.4	%
Provision for income taxes	(7,739		)	(6,368		)	2.1	%	1.4	%	1,371			21.5	%
Equity in losses of unconsolidated subsidiaries	—			(57		)	—	%	—	%	(57		)	(100.0	)%
NET INCOME	$	11,758		$	9,634		3.2	%	2.1	%	$	2,124		22.0	%

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Revenues

The primary driver of our decrease in revenues relates to reduced demand for services supporting Overseas Contingency Operations (OCO) as a result of the withdrawal of U.S. forces and reduction in military operations in Afghanistan. The reduction in our OCO related work in the three months ended March 31, 2015 as compared to the same period in 2014 was primarily due to reduced demand for field service support on C4ISR systems and reduced demand on a sustainment contract for Mine-Resistance Ambush-Protected (MRAP) vehicles. These reductions were partially offset by revenues from our recent acquisitions.

Cost of services

The decrease in cost of services was primarily due to reductions in revenues. As a percentage of revenues, direct labor costs increased to 48.5% for the three months endedMarch 31, 2015, compared to 43.7% for the same period in 2014. As a percentage of revenues, other direct costs, which include subcontractors and third party equipment and materials used in the performance of our contracts, decreased to 36.3% for the three months endedMarch 31, 2015, compared to 43.2% for the same period in 2014. We expect cost of services as a percentage of revenues to remain relatively stable or increase slightly for the remainder of 2015.

General and administrative expenses

The decrease in general and administrative expenses was due to cost reduction measures. As a percentage of revenues, general and administrative expensesincreasedfor thethree months ended March 31, 2015when compared to the same period in2014. We expect general and administrative expenses as a percentage of revenues to remain relatively stable or slightly decrease for the remainder of 2015.

Interest expense

The decrease in interest expense was primarily due to the redemption of the 7.25% senior unsecured notes on April 15, 2014. For additional information on the redemption of the 7.25% senior unsecured notes on April 15, 2014, see our Annual Report on Form 10-K for fiscal year endedDecember 31, 2014, previously filed with the SEC.We expect interest expense to remain relatively stable for the remainder of 2015.

Provision for income taxes

Our effective tax rate is affected by recurring items, such as tax rates and the relative amount of income we earn in various taxing jurisdictions. It is also affected by discrete items that may occur in any given year, but are not consistent from year-to-year. Our effective income tax rates were 39.7% and 39.8% for the three months endedMarch 31, 2015 and 2014, respectively. For the remainder of 2015, we expect our effective tax rate to remain relatively consistent or decline.

Backlog

At March 31, 2015 and December 31, 2014, our backlog was $3.0 billion and $3.3 billion, respectively, of which $0.9 billion and $0.8 billion, respectively, was funded backlog. The decrease in our backlog is primarily due to low award volume in the first quarter of 2015. Backlog represents estimates that we calculate on a consistent basis. For additional information on how we compute backlog, see our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, previously filed with the SEC.

Liquidity and Capital Resources

Historically, our primary liquidity needs have been the financing of acquisitions, working capital, payment under our cash dividend program and capital expenditures. Our primary sources of liquidity are cash provided by operations and our revolving credit facility.

On March 31, 2015, our cash and cash equivalents balance was $43.6 million. There were no outstanding borrowings under our revolving credit facility at March 31, 2015. At March 31, 2015, we were contingently liable under letters of credit totaling $0.8 million, which reduced our ability to borrow under our revolving credit facility by that amount. The maximum available borrowing under our revolving credit facility at March 31, 2015 was $499.2 million.

Generally, cash provided by operating activities is adequate to fund our operations, including payments under our regular cash dividend program. Due to fluctuations in our cash flows and level of operations, it is necessary from time-to-time to borrow under our revolving credit facility to meet cash demands.

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Cash Flows from Operating Activities

Our operating cash flows are primarily affected by our ability to invoice and collect from our clients in a timely manner, our ability to manage our vendor payments and the overall profitability of our contracts. We bill most of our customers monthly after services are rendered. Our accounts receivable days sales outstanding (DSO) were 87 and 78 as of March 31, 2015 and 2014, respectively. For the three months endedMarch 31, 2015 and 2014, our net cash flows from operating activities were $25.9 million and $62.3 million, respectively. The decrease in net cash flows from operating activities during the three months endedMarch 31, 2015 when compared to the same period in 2014 was primarily due to the timing of cash collections of receivables, offset by timing of vendor payments.

Cash Flows from Investing Activities

Our cash flows from investing activities consist primarily of business combinations, purchases of property and equipment and investments in capitalized software for internal use. For the three months endedMarch 31, 2015 and 2014, our net cash outflows from investing activities were $2.4 million and $48.5 million, respectively. During the three months endedMarch 31, 2015, our net cash outflows from investing activities were primarily due to capital expenditures. During the three months endedMarch 31, 2014, our net cash outflows from investing activities were primarily due to the acquisition of Allied Technology Group, Inc. and investments in capitalized software for internal use.

Cash Flows from Financing Activities

For the three months endedMarch 31, 2015 and 2014, our net cash outflows from financing activities were $3.6 million and $7.2 million, respectively. During the three months endedMarch 31, 2015, our net cash outflows from financing activities resulted primarily from dividends paid, offset by the proceeds from the exercise of stock options. During thethree months endedMarch 31, 2014, our net cash outflows from financing activities resulted primarily from dividends paid.

Capital Resources

We believe the capital resources available to us from cash on hand of $43.6 million at March 31, 2015, the $500.0 million available under our revolving credit facility and cash from our operations are adequate to fund our anticipated cash requirements for at least the next year, including payments under our regular cash dividend program. We anticipate financing acquisitions and our longer-term internal growth through one or more of the following sources: cash from operations, use of our revolving credit facility; and additional borrowing or issuance of debt or equity.

Short-term Borrowings

From time-to-time, we borrow funds against our revolving credit facility for working capital requirements and funding of operations, as well as acquisitions. Borrowings under our revolving credit facility bear interest at one of the following variable rates as selected by us at the time of the borrowing: a LIBOR based rate plus market spreads (1.25% to 2.25% based on our consolidated total leverage ratio) or Bank of America's base rate plus market spreads (0.25% to 1.25% based on our consolidated total leverage ratio). In the next year we may use, as needed, our revolving credit facility or additional sources of borrowings in order to fund our anticipated cash requirements.

Cash Management

To the extent possible, we invest our available cash in short-term, investment grade securities in accordance with our investment policy. Under our investment policy, we manage our investments in accordance with the priorities of maintaining the safety of our principal, maintaining the liquidity of our investments, maximizing the yield on our investments and investing our cash to the fullest extent possible. Our investment policy provides that no investment security can have a final maturity that exceeds six months and that the weighted average maturity of the portfolio cannot exceed 60 days. Cash and cash equivalents include cash on hand, amounts due from banks and short-term investments with maturity dates of three months or less at the date of purchase.

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Dividend

During each of the three months endedMarch 31, 2015 and 2014, we declared and paid quarterly dividends in the amount of $0.21 per share on both classes of common stock. While we expect to continue the regular cash dividend program, any future dividends declared will be at the discretion of our Board of Directors and will depend, among other factors, upon our results of operations, financial condition and cash requirements, as well as such other factors that our Board of Directors deems relevant.

Critical Accounting Estimates and Policies

Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and potentially result in materially different results under different assumptions and conditions. Application of these policies is particularly important to the portrayal of our financial condition and results of operations. The discussion and analysis of our financial condition and results of operations are based on our condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these condensed consolidated financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses. Actual results may differ from these estimates under different assumptions or conditions. Our significant accounting policies, including the critical accounting policies and practices listed below, are more fully described and discussed in the notes to the consolidated financial statements for the fiscal year 2014 included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, filed with the SEC on February 20, 2015.

Revenue Recognition and Cost Estimation

We recognize revenues when persuasive evidence of an arrangement exists, services have been rendered, the contract price is fixed or determinable and collectability is reasonably assured. We have a standard internal process that we use to determine whether all required criteria for revenue recognition have been met.

Our revenues consist primarily of services provided by our employees and the pass through of costs for materials and subcontract efforts under contracts with our customers. Cost of services consists primarily of compensation expenses for program personnel, the fringe benefits associated with this compensation and other direct expenses incurred to complete programs, including cost of materials and subcontract efforts.

We derive the majority of our revenues from cost-plus-fixed-fee, cost-plus-award-fee, firm-fixed-price and time-and-materials contracts. Revenues for cost reimbursement contracts are recorded as reimbursable costs are incurred, including an estimated share of the applicable contractual fees earned. For performance-based fees under cost reimbursable contracts, we recognize the relevant portion of the expected fee to be awarded by the customer at the time such fee can be reasonably estimated, based on factors such as our prior award experience and communications with the customer regarding performance, or upon approval by the customer. For time-and-material contracts, revenues are recognized to the extent of billable rates times hours delivered plus material and other reimbursable costs incurred. For long-term fixed-price production contracts, revenues are recognized at a rate per unit as the units are delivered or by other methods to measure services provided. Revenues from other long-term fixed-price contracts is recognized ratably over the contract period or by other appropriate methods to measure services provided. Contract costs are expensed as incurred except for certain limited long-term contracts noted below. For long-term contracts specifically described in the ASC 605-35, we apply the percentage of completion method. Under the percentage of completion method, income is recognized at a consistent profit margin over the period of performance based on estimated profit margins at completion of the contract. This method of accounting requires estimating the total revenues and total contract cost at completion of the contract. During the performance of long-term contracts, these estimates are periodically reviewed and revisions are made as required using the cumulative catch-up method of accounting. The impact on revenue and contract profit as a result of these revisions is included in the periods in which the revisions are made. This method can result in the deferral of costs or the deferral of profit on these contracts. Because we assume the risk of performing a fixed-price contract at a set price, the failure to accurately estimate ultimate costs or to control costs during performance of the work could result, and in some instances has resulted, in reduced profits or losses for such contracts. Both the individual changes in contract estimates and aggregate net changes in the contract estimates recognized using the cumulative catch-up method of accounting were not material to the consolidated statement of operations for all periods presented. Estimated losses on contracts at completion are recognized when identified. In certain circumstances, revenues are recognized when contract amendments have not been finalized.

Accounting for Business Combinations and Goodwill and Other Intangible Assets

The purchase price of an acquired business is allocated to the tangible assets, financial assets and separately recognized intangible assets acquired less liabilities assumed based upon their respective fair values, with the excess recorded as goodwill.

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Such fair value assessments require judgments and estimates that can be affected by contract performance and other factors over time, which may cause final amounts to differ materially from original estimates.

We review goodwill at least annually for impairment, or whenever events or circumstances indicate that the carrying value of long-lived assets may not be fully recoverable. We perform this review at the reporting unit level, which is one level below our reportable segment. An entity may assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. An entity has an unconditional option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. The first step of the goodwill impairment test compares the fair value of a reporting unit with its carrying amount (including goodwill). If the reporting unit's fair value exceeds its carrying value, no further procedures are required. However, if the reporting unit's fair value is less than its carrying value, an impairment of goodwill may exist, requiring a second step to be performed. Step two of this test measures the amount of the impairment loss, if any. Step two of this test requires the allocation of the reporting unit's value to its assets and liabilities, including any unrecognized intangible assets, in a hypothetical analysis that calculates the implied fair value of the goodwill as if the reporting unit were being acquired in a business combination. If the implied fair value of goodwill is less than the carrying value, the difference is recorded as a goodwill impairment charge in operations.

The fair values of the reporting units are determined based on a weighting of the income approach, market approach and market transaction approach. The income approach is a valuation technique in which fair value is calculated based on forecasted future cash flow discounted at the appropriate rate of return commensurate with the risk as well as current rates of return for equity and debt capital as of the valuation date. The forecast used in our estimation of fair value was developed by management based on a contract basis, incorporating adjustments to reflect known contract and market considerations (such as reductions and uncertainty in government spending, pricing pressure and opportunities). The discount rate utilizes a risk adjusted weighted average cost of capital. The market approach is a valuation technique in which the fair value is calculated based on market prices realized in actual arm's length transactions. The technique consists of undertaking a detailed market analysis of publicly traded companies that provides a reasonable basis for comparison to us. Valuation ratios, which relate market prices to selected financial statistics derived from comparable companies, are selected and applied to us after consideration of adjustments for financial position, growth, market, profitability and other factors. The market transaction approach is a valuation technique in which the fair value is calculated based on market prices realized in actual arm's length transactions. The technique consists of undertaking a detailed market analysis of merged and acquired companies that provided a reasonable basis for comparison to us. Valuation ratios, which relate market prices to selected financial statistics derived from comparable companies, are selected and applied to us after consideration of adjustments for financial position, growth, market, profitability and other factors. To assess the reasonableness of the calculated reporting unit fair values, we compare the sum of the reporting units' fair values to our market capitalization (per share stock price times the number of shares outstanding) and calculate an implied control premium, which we then compare to the control premiums in comparable transactions to assess the reasonableness of our calculations.

We have elected to perform our annual review during the fourth quarter of each calendar year. In addition, management monitors events and circumstances that could result in an impairment. A significant amount of judgment is involved in determining if an indicator of impairment has occurred between annual testing dates. Events that could cause the fair value of our long-lived assets to decrease include: changes in our business environment or market conditions, a material change in our financial outlook, including declines in expected revenue growth rates and operating margins, or a material decline in the market price of our stock. If any impairment were indicated as a result of a review, we would recognize a loss based on the amount by which the carrying amount exceeds the estimated fair value.

Due to the many variables inherent in the estimation of a reporting unit's fair value and the relative size of our goodwill, differences in assumptions may have a material effect on the results of our goodwill impairment analysis.

Accounting Standards Updates

In April 2015, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2015-03, Interest - Imputation of Interest (Subtopic 835-10): Simplifying the Presentation of Debt Issuance Costs. The update requires debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the related debt liability instead of being presented as an asset. Debt disclosures will include the face amount of the debt liability and the effective interest rate. The update requires retrospective application and represents a change in accounting principle. The update is effective for fiscal years beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. We are evaluating the impact of ASU 2015-03 on our consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. ASU 2015-02 requires management to evaluate whether limited partnerships and similar legal entities are variable interest entities

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(VIEs) or voting interest entities. ASU 2015-02 eliminates the presumption that a general partner should consolidate a limited partnership and affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships. ASU 2015-02 also provides a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this update are effective for interim and annual periods beginning after December 15, 2015. Early adoption is permitted. A reporting entity may apply the amendments in ASU 2015-02 using: (a) a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption; or (b) by applying the amendments retrospectively. We are currently evaluating both methods of adoption as well as the effect ASU 2015-02 will have on our consolidated financial statements.

In January 2015, the FASB issued ASU No. 2015-01, Income Statement - Extraordinary and Unusual Items (Subtopic 225-20) - Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items, which eliminates from GAAP the concept of extraordinary items. The Board concluded that the amendments in this ASU will not result in a loss of information because although the amendments will eliminate the requirements in Subtopic 225-20 for reporting entities to consider whether an underlying event or transaction is extraordinary, the presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring. The ASU is effective for annual periods ending after December 15, 2015, and interim periods thereafter. A reporting entity also may apply the amendments retrospectively to all prior periods presented in the financial statements. Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption. The adoption of ASU 2015-01 is not expected to have a material impact on our results of operations, financial position or cash flows.

On August 27, 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern, which provides guidance on determining when and how reporting entities must disclose going-concern uncertainties in their financial statements. The new standard requires management to perform interim and annual assessments of an entity's ability to continue as a going concern within one year of the date of issuance of an entity's financial statements. Further, an entity must provide certain disclosures if there is substantial doubt about the entity's ability to continue as a going concern. The ASU is effective for annual periods ending after December 15, 2016, and interim periods thereafter; early adoption is permitted. The adoption of ASU 2014-15 is not expected to have a material impact on our results of operations, financial position or cash flows.

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. ASU 2014-09 supersedes existing revenue recognition guidance, including Accounting Standards Codification (ASC) No. 605-35, Revenue Recognition - Construction-Type and Production-Type Contracts.  ASU 2014-09 outlines a single set of comprehensive principles for recognizing revenue under U.S. GAAP. Among other things, it requires companies to identify contractual performance obligations and determine whether revenue should be recognized at a point in time or over time. These concepts, as well as other aspects of ASU 2014-09, may change the method and/or timing of revenue recognition for certain of our contracts. ASU 2014-09 will be effective January 1, 2017, and may be applied either retrospectively or through the use of a modified-retrospective method. On April 1, 2015, the FASB proposed deferring the effective date by one year to December 15, 2017 for annual periods beginning after that date. We are currently evaluating both methods of adoption as well as the effect ASU 2014-09 will have on our consolidated financial statements.

Other accounting standards updates effective after March 31, 2015, are not expected to have a material effect on our condensed consolidated financial statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Our exposure to market risks relates to changes in interest rates for borrowing under our revolving credit facility. At March 31, 2015, there was no outstanding balance on our revolving credit facility. Borrowings under our revolving credit facility bear interest at variable rates. A hypothetical 10% increase in interest rates would have no effect on our interest expense for the three months endedMarch 31, 2015.

We do not use derivative financial instruments for speculative or trading purposes. When we have excess cash, we invest in short-term, investment grade, interest-bearing securities. Our investments are made in accordance with an investment policy. Under this policy, no investment securities can have maturities exceeding six months and the weighted average maturity of the portfolio cannot exceed 60 days.

23

Item 4. Controls and Procedures

Management is responsible for establishing and maintaining adequate disclosure controls and procedures. Disclosure controls and procedures are designed to provide reasonable assurance that information required to be disclosed in our reports filed or submitted under the Exchange Act, such as this Quarterly Report on Form 10-Q, is accurately recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures are also designed to provide reasonable assurance that such information is accumulated and communicated to our management, including our principal executive officer and our principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

It should be noted that a control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints and the benefits of controls must be considered relative to their costs. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. As a result, our disclosure controls and procedures are designed to provide reasonable assurance that such disclosure controls and procedures will meet their objectives.

As of March 31, 2015, under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer (our principal executive officer and principal financial officer, respectively), management evaluated the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15 of the Exchange Act. Based upon this evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective at the reasonable assurance level described above.

There were no changes in our internal control overfinancial reporting during our last fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

24

PART II – OTHER INFORMATION

Item 1. Legal Proceedings

We are subject to certain legal proceedings, government audits, investigations, claims and disputes that arise in the ordinary course of our business. Like most large government defense contractors, our contract costs are audited and reviewed on a continual basis by an in-house staff of auditors from the Defense Contract Auditing Agency. In addition to these routine audits, we are subject from time-to-time to audits and investigations by other agencies of the U.S. government. These audits and investigations are conducted to determine if our performance and administration of our government contracts are compliant with contractual requirements and applicable federal statutes and regulations. An audit or investigation may result in a finding that our performance, systems and administration are compliant or, alternatively, may result in the government initiating proceedings against us or our employees, including administrative proceedings seeking repayment of monies, suspension and/or debarment from doing business with the U.S. government or a particular agency, or civil or criminal proceedings seeking penalties and/or fines. Audits and investigations conducted by the U.S. government frequently span several years.

Although we cannot predict the outcome of these and other legal proceedings, investigations, claims and disputes, based on the information now available to us, we do not believe the ultimate resolution of these matters, either individually or in the aggregate, will have a material adverse effect on our business, prospects, financial condition, operating results or cash flows.

Item 1A. Risk Factors

There have been no material changes from the risk factors described in the “Risk Factors” section of our Annual Report on the Form 10-K for the year ended December 31, 2014.

Item 6. Exhibits

Exhibits required by Item 601 of Regulation S-K:

Exhibit	Description of Exhibit
10.1*	ManTech International Corporation 2015 Executive Incentive Compensation Plan, adopted on March 11, 2015, in which our executive officers participate (incorporated herein by reference from Registrant's Current Report on Form 8-K filed with the SEC on March 17, 2015).
10.2*	Form of Performance-Based Restricted Stock Unit Award Agreement (incorporated herein by reference from Registrant's Current Report on Form 8-K filed with the SEC on March 17, 2015).
31.1‡	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended.
31.2‡	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended.
32‡	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended.
101	The following materials from the ManTech International Corporation Quarterly Report on Form 10-Q for the quarter ended March 31, 2015, formatted in XBRL (eXtensible Business Reporting Language): (i) Condensed Consolidated Balance Sheets at March 31, 2015 and December 31, 2014; (ii) Condensed Consolidated Statements of Income for the Three Months Ended March 31, 2015 and 2014; (iii) Condensed Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2015 and 2014; (iv) Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2015 and 2014; and (v) Notes to Condensed Consolidated Financial Statements.

* Management contract or compensatory plan or arrangement.

‡ Filed herewith.

25

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		MANTECH INTERNATIONAL CORPORATION
		By:	/s/    GEORGE J. PEDERSEN
Date:	May 1, 2015	Name:	George J. Pedersen
		Title:	Chairman of the Board of Directors and Chief Executive Officer

		By:	/s/    KEVIN M. PHILLIPS
Date:	May 1, 2015	Name:	Kevin M. Phillips
		Title:	Chief Financial Officer

26

EX-31.1

Exhibit 31.1

CERTIFICATION

I, George J. Pedersen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of ManTech International Corporation;

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(s) 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 (the registrant's fourth fiscal quarter in the case of an annual report) 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(s) 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 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 1, 2015

By:	/s/    GEORGE J. PEDERSEN
Name:	George J. Pedersen
Title:	Chairman of the Board of Directors and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Kevin M. Phillips, certify that:

1. I have reviewed this quarterly report on Form 10-Q of ManTech International Corporation;

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(s) 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 (the registrant's fourth fiscal quarter in the case of an annual report) 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(s) 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 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 1, 2015

By:	/s/    KEVIN M. PHILLIPS
Name:	Kevin M. Phillips
Title:	Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the ManTech International Corporation (the “Company”) Quarterly Report on Form 10-Q for the period ending March 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, George J. Pedersen, Chairman of the Board and Chief Executive Officer of the Company, and Kevin M. Phillips, Chief Financial Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Date: May 1, 2015

By:	/s/    GEORGE J. PEDERSEN
Name:	George J. Pedersen
Title:	Chairman of the Board of Directors and Chief Executive Officer

By:	/s/    KEVIN M. PHILLIPS
Name:	Kevin M. Phillips
Title:	Chief Financial Officer

XML

Stock-Based Compensation (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended
	Jan. 02, 2015	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Percentage Increase In Number Of Shares Available For Issuance	1.50%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	560,584
Remaining Aggregate Number of Shares Authorized For Issuance		4,702,660
Stock Compensation Expense		$ 1,200,000	$ 1,200,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount		0	0
Tax Effect from Share-based Compensation, Net		(1,500,000)	(1,800,000)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		5 years	5 years
Expected Annual Cash Dividend		$ 0.84
Granted, Weighted Average Fair Value		$ 5.04	$ 4.89
Share-based Payment Award, Options, Vested, Fair Value		1,800,000	2,600,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized		$ 5,100,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition		2 years
Restricted Stock Granted to Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year	1 year
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued and Outstanding Under The Plan		4,945,818
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		8 years	8 years

XML

Subsequent Event (Narrative) (Details) (Welkin Associates, Ltd. [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 27, 2015
Welkin Associates, Ltd. [Member]
Subsequent Event [Line Items]
Business Combination, Consideration Transferred	$ 34.0

XML

Business Segment and Geographic Area Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Number of Reportable Segments	1
U.S. government under prime contracts and subcontracts [Member] | Revenues [Member]
Segment Reporting Information [Line Items]
Percentage	98.90%	98.90%
UNITED STATES | Revenues [Member]
Segment Reporting Information [Line Items]
Percentage	99.90%	99.70%
International [Member] | Revenues [Member]
Segment Reporting Information [Line Items]
Percentage	0.10%	0.30%

XML

Property and Equipment (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment—gross	$ 79,394	$ 79,260
Accumulated depreciation and amortization	(54,135)	(53,517)
Property and equipment—net	25,259	25,743
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment—gross	44,215	43,659
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—gross	$ 35,179	$ 35,601

XML

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following table summarizes weighted-average assumptions used in our calculations of fair value for the three months endedMarch 31, 2015 and 2014:

	Three months ended March 31,
	2015		2014
Volatility	27.16	%	29.86	%
Expected life of options	3 years		3 years
Risk-free interest rate	1.16	%	0.85	%
Dividend yield	3.00	%	3.00	%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes stock option activity for the year ended December 31, 2014 and the three months endedMarch 31, 2015:

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Stock options at December 31, 2013	3,400,120		$	35.51	$	4,488
Granted	946,576		$	29.12
Exercised	(158,371	)	$	24.78	$	754
Cancelled and expired	(797,293	)	$	41.75
Stock options at December 31, 2014	3,391,032		$	32.76	$	4,722
Granted	107,340		$	32.53
Exercised	(150,138	)	$	27.66	$	830
Cancelled and expired	(340,449	)	$	46.02
Stock options at March 31, 2015	3,007,785		$	31.50	$	11,505

Schedule of Non-vested Share Activity [Table Text Block]

The following table summarizes non-vested stock options for the three months endedMarch 31, 2015:

	Number of Shares		Weighted Average Fair Value
Non-vested stock options at December 31, 2014	1,673,528		$	4.83
Granted	107,340		$	5.04
Vested	(346,520	)	$	5.07
Cancelled	(51,665	)	$	4.87
Non-vested stock options at March 31, 2015	1,382,683		$	4.78

Stock Options Exercisable And Expected To Vest [Table Text Block]

The following table includes information concerning stock options exercisable and stock options expected to vest at March 31, 2015:

	Number of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Stock options exercisable	1,625,102	2 years	$	33.90	$	4,231
Stock options expected to vest	1,206,709	4 years	$	28.63	$	6,408
Stock options exercisable and expected to vest	2,831,811

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Activity [Table Text Block]

The following table summarizes the restricted stock activity during the year ended December 31, 2014:

	Number of Shares		Weighted Average Fair Value
Non-vested restricted stock at December 31, 2013	21,000
Granted	21,000		$	30.61
Vested	(21,000	)	$	27.65
Non-vested restricted stock at December 31, 2014	21,000

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Activity [Table Text Block]

The following table summarizes the nonvested restricted stock unit activity during the three months endedMarch 31, 2015:

	Number of Shares	Weighted Average Fair Value
Non-vested restricted stock units at December 31, 2014	—
Granted	103,900	$	30.92
Non-vested restricted stock units at March 31, 2015	103,900

XML

Stock-Based Compensation (Schedule of Non-vested Share Activity) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-vested [Roll Forward]
Non-vested stock options, Number of Shares, Period Start	1,673,528
Granted, Number of Shares	107,340		946,576
Vested, Number of Shares	(346,520)
Cancelled, Number of Shares	(51,665)
Non-vested stock options, Number of Shares, Period End	1,382,683		1,673,528
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-vested, Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested stock options, Weighted Average Fair Value, Period Start	$ 4.83
Granted, Weighted Average Fair Value	$ 5.04	$ 4.89
Vested, Weighted Average Fair Value	$ 5.07
Cancelled, Weighted Average Fair Value	$ 4.87
Non-vested stock options, Weighted Average Fair Value, Period End	$ 4.78		$ 4.83

XML

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets, Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
For the remaining nine months ending December 31, 2015	$ 15,018
For the year ending:
December 31, 2016	17,858
December 31, 2017	15,859
December 31, 2018	14,364
December 31, 2019	12,509
December 31, 2020	$ 11,283

XML

Equity Method Investments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Equity in losses of unconsolidated subsidiaries	$ 0	$ 57,000
Fluor-ManTech Logistics Solutions, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%	50.00%
Equity in losses of unconsolidated subsidiaries	0	57,000
Equity Method Investments	0		0
Liability Owed to Equity Method Investment			735,000
GenTech Partners Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%	49.00%	49.00%
Equity in losses of unconsolidated subsidiaries	0	0
Equity Method Investments	$ 141,000		$ 141,000
Fluor International, Inc. [Member] | Fluor-ManTech Logistics Solutions, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%	50.00%
Genex Systems, LLC [Member] | GenTech Partners Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	51.00%	51.00%	51.00%

XML

Acquisitions (Notes)

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Acquisitions Disclosure [Text Block]

Acquisitions

7Delta Inc.—On May 23, 2014, we completed the acquisition of all equity interests in 7Delta Inc. (7Delta). The results of 7Delta's operations have been included in our condensed consolidated financial statements since that date. The acquisition was completed through a stock purchase agreement dated May 23, 2014, by and among ManTech International Corporation, 7Delta, SLS Holdings, Inc. and the stockholders of SLS Holdings, Inc. 7Delta performs critical services such as applications and software development, program management, systems integration, information assurance and security architecture primarily within the healthcare community at the Department of Veteran Affairs (VA). We funded the acquisition through a combination of cash on hand and borrowings under our revolving credit facility. The stock purchase agreement did not contain provisions for contingent consideration.

During the three months ended March 31, 2014, we incurred approximately $0.2 million of acquisition costs related to the 7Delta transaction, which are included in the general and administrative expenses in our condensed consolidated statement of income.

The purchase price of $81.4 million was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. We recorded goodwill of $70.0 million, which will be deductible for tax purposes over 15 years, assuming adequate levels of taxable income. Recognition of goodwill is largely attributed to the value paid for 7Delta's capabilities in providing software development, program management, system integration, information assurance and security architecture to the VA.

In allocating the purchase price, we considered among other factors, analysis of historical financial performance and estimates of future performance of 7Delta's contracts. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $4.8 million and $2.9 million, respectively. Customer contracts and related relationships represent the underlying relationships and agreements with 7Delta's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 10 years. Backlog is amortized straight-line over its estimated useful life of 2 years. The weighted-average amortization period for the intangible assets is 7 years.

The following table represents purchase price allocation for 7Delta (in thousands):

	7Delta Inc.
Cash and cash equivalents	$	1,408
Receivables	9,664
Prepaid expenses and other	175
Goodwill	69,967
Other intangible assets	7,762
Property and equipment	597
Other assets	39
Accounts payable and accrued expenses	(6,617		)
Accrued salaries and related expenses	(1,399		)
Billings in excess of revenue earned	(229		)
Net assets acquired and liabilities assumed	$	81,367

We have not disclosed current period, nor pro forma, revenues and earnings attributable to 7Delta as our integration of these operations post-acquisition and the entity's accounting methods pre-acquisition make it impracticable.

Allied Technology Group, Inc.—On February 18, 2014, we completed the acquisition of all equity interests in Allied Technology Group, Inc. (ATG). The results of ATG's operations have been included in our condensed consolidated financial statements since that date. The acquisition was completed through a stock purchase agreement dated February 18, 2014, by and among ManTech Advanced Systems International, Inc., Allied Technology Group, Inc. and the stockholders of ATG. ATG is an innovative engineering and information management solution company with strong customer relationships and strategic contracts with the Department of Homeland Security (DHS). ATG provides IT, engineering services, program management and training solutions to a variety of federal customers. The acquisition is enabling us to deliver services through their unrestricted prime position on DHS's primary acquisition vehicles: Technical, Acquisition and Business Support Services and Enterprise Acquisition Gateway for Leading Edge Solutions II. We funded the acquisition with cash on hand. The stock purchase agreement did not contain provisions for contingent consideration.

During the three months ended March 31, 2014, we incurred approximately $0.2 million of acquisition costs related to the ATG transaction, which are included in the general and administrative expenses in our condensed consolidated statement of income.

The purchase price of $45.0 million was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. We recorded goodwill of $28.8 million, which will be deductible for tax purposes over 15 years, assuming adequate levels of taxable income. Recognition of goodwill is largely attributed to the value paid for ATG's capabilities in providing technology service program management, systems engineering and information technology services to DHS.

In allocating the purchase price, we considered among other factors, analysis of historical financial performance and estimates of future performance of ATG's contracts. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $6.4 million and $0.6 million, respectively. Customer contracts and related relationships represent the underlying relationships and agreements with ATG's existing customers. Customer relationships are amortized using the pattern of benefits method over their estimated useful lives of approximately 20 years. Backlog is amortized straight-line over its estimated useful life of 1 year. The weighted-average amortization period for the intangible assets is 18 years.

The following table represents the purchase price allocation for ATG (in thousands):

	Allied Technology Group, Inc.
Cash and cash equivalents	$	712
Receivables	11,670
Prepaid expenses and other	1,432
Contractual inventory	1
Goodwill	28,806
Other intangible assets	7,071
Property and equipment	899
Other assets	111
Accounts payable and accrued expenses	(3,399		)
Accrued salaries and related expenses	(2,155		)
Billings in excess of revenue earned	(148		)
Net assets acquired and liabilities assumed	$	45,000

We have not disclosed current period, nor pro forma, revenues and earnings attributable to ATG as our integration of these operations post-acquisition and the entity's accounting methods pre-acquisition make it impracticable.

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Stock-Based Compensation (Stock Options Exercisable And Expected To Vest) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Share-based Compensation [Abstract]
Stock options exercisable, Number of Shares	1,625,102
Stock options expected to vest, Number of Shares	1,206,709
Stock options exercisable and expected to vest, Number of Shares	2,831,811
Stock options exercisable, Weighted Average Remaining Contractual Life	2 years
Stock options exercisable, Weighted Average Exercise Price	$ 33.90
Stock options exercisable, Aggregate Intrinsic Value	$ 4,231
Stock options expected to vest, Weighted Average Remaining Contractual Life	4 years
Stock options expected to vest, Weighted Average Exercise Price	$ 28.63
Stock options expected to vest, Aggregate Intrinsic Value	$ 6,408

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Earnings Per Share (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Earnings Per Share [Abstract]
Number of Dividends Declared and Paid	1	1
Common Stock, Dividends, Per Share, Cash Paid	$ 0.21	$ 0.21
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,000,000	2,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	150,138	24,767	158,371

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Acquisitions (Schedule of Purchase Price Allocation) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 851,640	$ 851,640	$ 752,867
7Delta Inc. [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	1,408
Receivables	9,664
Prepaid expenses and other	175
Goodwill	69,967
Other intangible assets	7,762
Property and equipment	597
Other assets	39
Accounts payable and accrued expenses	(6,617)
Accrued salaries and related expenses	(1,399)
Billings in excess of revenue earned	(229)
Net assets acquired and liabilities assumed	81,367
Allied Technology Group, Inc [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	712
Receivables	11,670
Prepaid expenses and other	1,432
Contractual inventory	1
Goodwill	28,806
Other intangible assets	7,071
Property and equipment	899
Other assets	111
Accounts payable and accrued expenses	(3,399)
Accrued salaries and related expenses	(2,155)
Billings in excess of revenue earned	(148)
Net assets acquired and liabilities assumed	$ 45,000

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Stock-Based Compensation (Schedule Of Share-based Compensation, Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Non-vested [Roll Forward]
Non-vested, Number of Shares, Period Start	21,000
Granted, Number of Shares	21,000
Vested, Number of Shares	(21,000)
Non-vested, Number of Shares, Period End	21,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Granted, Weighted Average Fair Value	$ 30.61
Vested, Weighted Average Fair Value	$ 27.65

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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Components of Earnings Per Share, Basic and Diluted [Line Items]
Distributed earnings	$ 7,860	$ 7,814
Undistributed earnings	3,898	1,820
Net income	11,758	9,634
Class A common stock
Components of Earnings Per Share, Basic and Diluted [Line Items]
Basic net income available to common stockholders	7,610	6,216
Basic weighted average common shares outstanding	24,206,000	23,988,000
Basic earnings per share	$ 0.31	$ 0.26
Diluted net income available to common stockholders	7,627	6,222
Effect of potential exercise of stock options	153,000	69,000
Diluted weighted average common shares outstanding	24,359,000	24,057,000
Diluted earnings per share	$ 0.31	$ 0.26
Class B common stock
Components of Earnings Per Share, Basic and Diluted [Line Items]
Basic net income available to common stockholders	4,148	3,418
Basic weighted average common shares outstanding	13,193,000	13,193,000
Basic earnings per share	$ 0.31	$ 0.26
Diluted net income available to common stockholders	$ 4,131	$ 3,412
Effect of potential exercise of stock options	0	0
Diluted weighted average common shares outstanding	13,193,000	13,193,000
Diluted earnings per share	$ 0.31	$ 0.26

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Receivables (Schedule of Contract Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Billed receivables	$ 266,470	$ 319,065
Unbilled receivables:
Amounts billable	78,616	50,393
Revenues recorded in excess of funding	15,693	13,082
Retainage	7,331	4,446
Allowance for doubtful accounts	(9,744)	(9,830)
Receivables—net	$ 358,366	$ 377,156

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Basis of Presentation (Notes)

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation [Text Block]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and note disclosures normally included in the annual financial statements, prepared in accordance with accounting principles generally accepted in the United States of America, have been condensed or omitted pursuant to those rules and regulations. We recommend that you read these unaudited condensed consolidated financial statements in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, previously filed with the SEC. We believe that the unaudited condensed consolidated financial statements in this Form 10-Q reflect all adjustments that are necessary to fairly present the financial position, results of operations and cash flows for the interim periods presented. The results of operations for such interim periods are not necessarily indicative of the results that can be expected for the full year.

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Receivables (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Receivables [Abstract]
Accounts Receivable Not Expected to be Substantially Collected within One Year	$ 1.1
Percentage of Receivable Not Expected to be Collected within One Year related to Receivables from Direct Sales To U.S. Government	90.60%

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Stock-Based Compensation (Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation [Abstract]
Volatility	27.16%	29.86%
Expected life of options	3 years	3 years
Risk-free interest rate	1.16%	0.85%
Dividend yield	3.00%	3.00%

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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 43,628	$ 23,781
Receivables—net	358,366	377,156
Prepaid expenses and other	18,492	18,207
Total Current Assets	420,486	419,144
Goodwill	851,640	851,640
Other intangible assets—net	150,365	155,250
Employee supplemental savings plan assets	32,386	31,741
Property and equipment—net	25,259	25,743
Other assets	3,910	3,884
TOTAL ASSETS	1,484,046	1,487,402
LIABILITIES
Accounts payable and accrued expenses	122,996	149,506
Accrued salaries and related expenses	66,227	57,409
Billings in excess of revenue earned	17,873	13,408
Deferred income taxes—current	3,232	3,330
Total Current Liabilities	210,328	223,653
Deferred income taxes—non-current	69,774	65,103
Accrued retirement	30,261	32,804
Other long-term liabilities	11,162	11,063
TOTAL LIABILITIES	321,525	332,623
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Additional paid-in capital	432,762	428,895
Treasury stock	(9,158)	(9,158)
Retained earnings	738,771	734,873
Accumulated other comprehensive loss	(232)	(207)
TOTAL STOCKHOLDERS’ EQUITY	1,162,521	1,154,779
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,484,046	1,487,402
Class A common stock
STOCKHOLDERS' EQUITY
Common stock	246	244
Class B common stock
STOCKHOLDERS' EQUITY
Common stock	$ 132	$ 132

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Stock-Based Compensation (Schedule of Share-based Compensation, Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Nonvested, Number of Shares [Roll Forward]
Non-vested, Number of Shares, Period Start	0
Granted, Number of Shares	103,900
Non-vested, Number of Shares, Period End	103,900
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Granted, Weighted Average Fair Value	$ 30.92

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Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 11,758,000	$ 9,634,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,178,000	7,592,000
Deferred income taxes	2,966,000	2,825,000
Stock-based compensation	1,210,000	1,226,000
Excess tax benefits from exercise of stock options	(58,000)	(10,000)
Equity in losses of unconsolidated subsidiaries	0	57,000
Change in assets and liabilities—net of effects from acquired businesses:
Receivables—net	18,790,000	77,448,000
Prepaid expenses and other	(298,000)	2,423,000
Contractual inventory	0	3,717,000
Accounts payable and accrued expenses	(25,698,000)	(46,987,000)
Accrued salaries and related expenses	8,818,000	7,622,000
Billings in excess of revenue earned	4,465,000	(440,000)
Accrued retirement	(2,543,000)	(2,460,000)
Other	(738,000)	(393,000)
Net cash flow from operating activities	25,850,000	62,254,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,572,000)	(909,000)
Investment in unconsolidated subsidiaries	(750,000)	(21,000)
Investment in capitalized software for internal use	(96,000)	(2,603,000)
Proceeds from sale of investment	13,000	0
Acquisition of businesses—net of cash acquired	0	(44,927,000)
Net cash flow from investing activities	(2,405,000)	(48,460,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(7,856,000)	(7,809,000)
Proceeds from exercise of stock options	4,200,000	633,000
Borrowings under revolving credit facility	1,500,000	0
Repayments under revolving credit facility	(1,500,000)	0
Excess tax benefits from exercise of stock options	58,000	10,000
Net cash flow from financing activities	(3,598,000)	(7,166,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	19,847,000	6,628,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	23,781,000	269,001,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	43,628,000	275,629,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	252,000	313,000
Cash paid for income taxes	$ 80,000	$ 610,000

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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill, period start	$ 752,867	$ 851,640
Acquisitions	98,773
Goodwill, period end	$ 851,640	$ 851,640

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Receivables (Tables)

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Schedule of Contract Receivables [Table Text Block]

The components of contract receivables are as follows (in thousands):

	March 31, 2015			December 31, 2014
Billed receivables	$	266,470		$	319,065
Unbilled receivables:
Amounts billable	78,616			50,393
Revenues recorded in excess of funding	15,693			13,082
Retainage	7,331			4,446
Allowance for doubtful accounts	(9,744		)	(9,830		)
Receivables—net	$	358,366		$	377,156

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Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 301,419	$ 301,423
Accumulated Amortization	151,054	146,173
Net Carrying Amount	150,365	155,250
Contract and program intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	266,272	266,272
Accumulated Amortization	130,570	126,619
Net Carrying Amount	135,702	139,653
Capitalized software cost for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,032	35,036
Accumulated Amortization	20,428	19,500
Net Carrying Amount	14,604	15,536
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	115	115
Accumulated Amortization	56	54
Net Carrying Amount	$ 59	$ 61

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Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

The change in the carrying amount of goodwill during the year ended December 31, 2014 is as follows (in thousands):

	Goodwill Balance
Goodwill at December 31, 2013	$	752,867
Acquisitions	98,773
Goodwill at December 31, 2014	$	851,640

Schedule of Other Intangible Assets [Table Text Block]

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

	March 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Other intangible assets:
Contract and program intangible assets	$	266,272	$	130,570	$	135,702	$	266,272	$	126,619	$	139,653
Capitalized software cost for internal use	35,032		20,428		14,604		35,036		19,500		15,536
Other	115		56		59		115		54		61
Total other intangible assets—net	$	301,419	$	151,054	$	150,365	$	301,423	$	146,173	$	155,250

Schedule of Other Intangible Assets, Future Amortization Expense [Table Text Block]

We estimate that we will have the following amortization expense for the future periods indicated below (in thousands):

For the remaining nine months ending December 31, 2015	$	15,018
For the year ending:
December 31, 2016	$	17,858
December 31, 2017	$	15,859
December 31, 2018	$	14,364
December 31, 2019	$	12,509
December 31, 2020	$	11,283

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Description of the Business (Notes)

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of the Business [Text Block]

Description of the Business

ManTech International Corporation (depending on the circumstances, “ManTech,” “Company,” “we,” “our,” “ours” or “us”) is a leading provider of innovative technologies and solutions for mission-critical national security programs for the intelligence community; the departments of Defense, State, Homeland Security, Health and Human Services, Veteran Affairs, and Justice, including the Federal Bureau of Investigation (FBI); the space communities; and other U.S. government customers. We provide support to critical national security programs for approximately 50 federal agencies through approximately 1,000 current contracts. Our expertise includes cyber; software and systems development; enterprise information technology; multi-discipline intelligence; program protection and mission assurance; systems engineering; test and evaluation (T&E); command, control, communications, computers, intelligence, surveillance and reconnaissance (C4ISR); training; global logistics and supply chain management; and management consulting. We support major national missions, such as military readiness and wellness, terrorist threat detection, information security and border protection. Our employees operate primarily in the United States, as well as in numerous locations internationally.

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Condensed Consolidated Balance Sheets Parentheticals (USD $)	Mar. 31, 2015	Dec. 31, 2014
Treasury stock, Shares	244,113	244,113
Class A common stock
Common stock, Par value per share	0.01	0.01
Common stock, Shares authorized	150,000,000	150,000,000
Common stock, Shares issued	24,575,402	24,423,514
Common stock, Shares outstanding	24,331,289	24,179,401
Class B common stock
Common stock, Par value per share	0.01	0.01
Common stock, Shares authorized	50,000,000	50,000,000
Common stock, Shares issued	13,192,845	13,192,845
Common stock, Shares outstanding	13,192,845	13,192,845

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Business Segment and Geographic Area Information (Notes)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Business Segment and Geographic Area Information [Text Block]

Business Segment and Geographic Area Information

We have one reportable segment. We deliver a broad array of information technology and technical services solutions under contracts with the U.S. government. Our U.S. government customers typically exercise independent contracting authority, and even offices or divisions within an agency or department may directly, or through a prime contractor, use our services as a separate customer so long as that customer has independent decision-making and contracting authority within its organization. Revenues from the U.S. government under prime contracts and subcontracts were approximately 98.9% of our revenues for both of the three months endedMarch 31, 2015 and 2014. We treat sales to U.S. government customers as sales within the United States regardless of where the services are performed. U.S. revenues are approximately 99.9% and 99.7% of our total revenues for the three months endedMarch 31, 2015 and 2014, respectively. International revenues were approximately 0.1% and 0.3% of our total revenues for the three months endedMarch 31, 2015 and 2014, respectively. Furthermore, substantially all of our assets from continuing operations were held in the United States for the three months endedMarch 31, 2015 and year ended December 31, 2014.

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Document and Entity Information Document	3 Months Ended
	Mar. 31, 2015	Apr. 29, 2015
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	MANT
Entity Registrant Name	MANTECH INTERNATIONAL CORP
Entity Central Index Key	0000892537
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		24,331,289
Class B common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		13,192,845

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Equity Method Investments (Notes)

3 Months Ended

Mar. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments [Text Block]

Equity Method Investments

On May 24, 2012, Fluor-ManTech Logistics Solutions, LLC (FMLS), a limited liability company, was created with Fluor International, Inc. and ManTech as the investees. Each investee has a 50% ownership interest in FMLS. Because we have the ability to exercise significant influence over FMLS we determined that the equity method of accounting will be used for our investment. Under the operating agreement, we are required to provide additional financial support for losses incurred by FMLS. We recorded $0 and $57 thousand in equity method losses for the three months ended March 31, 2015 and 2014, respectively. We had no investment balance in FMLS as of March 31, 2015 and December 31, 2014. As of December 31, 2014, we recorded liabilities for $735 thousand, which were owed to FMLS for additional financial support and paid during the three months ended March 31, 2015.

On July 7, 2011, GenTech Partners Joint Venture (GenTech), was created with Genex Systems, LLC and ManTech as the investees. Genex Systems, LLC's interest is 51% and ManTech's interest in GenTech is 49%. Because we have the ability to exercise significant influence over GenTech, we determined that the equity method of accounting will be used for our investment. We recorded no equity method earnings for both the three months ended March 31, 2015 and 2014. Our investment balance in GenTech was $141 thousand as of March 31, 2015 and December 31, 2014.

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Condensed Consolidated Statements of Income (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
REVENUES	$ 370,330,000	$ 452,033,000
Cost of services	314,149,000	393,009,000
General and administrative expenses	36,335,000	38,982,000
OPERATING INCOME	19,846,000	20,042,000
Interest expense	(275,000)	(4,119,000)
Interest income	67,000	177,000
Other income (expense), net	(141,000)	(41,000)
INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS	19,497,000	16,059,000
Provision for income taxes	(7,739,000)	(6,368,000)
Equity in losses of unconsolidated subsidiaries	0	(57,000)
NET INCOME	$ 11,758,000	$ 9,634,000
Class A common stock
BASIC EARNINGS PER SHARE:
Basic earnings per share	$ 0.31	$ 0.26
DILUTED EARNINGS PER SHARE:
Diluted earnings per share	$ 0.31	$ 0.26
Class B common stock
BASIC EARNINGS PER SHARE:
Basic earnings per share	$ 0.31	$ 0.26
DILUTED EARNINGS PER SHARE:
Diluted earnings per share	$ 0.31	$ 0.26

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Property and Equipment (Notes)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment [Text Block]

Property and Equipment

Major classes of property and equipment are summarized as follows (in thousands):

	March 31, 2015			December 31, 2014
Furniture and equipment	$	44,215		$	43,659
Leasehold improvements	35,179			35,601
Property and equipment—gross	79,394			79,260
Accumulated depreciation and amortization	(54,135		)	(53,517		)
Property and equipment—net	$	25,259		$	25,743

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Receivables (Notes)

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Receivables [Text Block]

Receivables

We deliver a broad array of information technology and technical services solutions under contracts with the U.S. government, state and local governments and commercial customers. The components of contract receivables are as follows (in thousands):

	March 31, 2015			December 31, 2014
Billed receivables	$	266,470		$	319,065
Unbilled receivables:
Amounts billable	78,616			50,393
Revenues recorded in excess of funding	15,693			13,082
Retainage	7,331			4,446
Allowance for doubtful accounts	(9,744		)	(9,830		)
Receivables—net	$	358,366		$	377,156

Amounts billable consist principally of amounts to be billed within the next month. Revenues recorded in excess of funding are billable upon receipt of contractual amendments or other modifications. The retainage is billable upon completion of contract performance and approval of final indirect expense rates by the government. The allowance for doubtful accounts represents our exposure to compliance and contractual issues as well as bad debt related to prime contractors.

Accounts receivable at March 31, 2015 are expected to be substantially collected within one year except for approximately $1.1 million, of which 90.6% is related to receivables from direct sales to the U.S. government. The remainder is related to receivables from contracts in which we acted as a subcontractor to other contractors. We do not believe that we have significant exposure to credit risk as accounts receivable and the related unbilled amounts are primarily due from the U.S. government.

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Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment [Table Text Block]

Major classes of property and equipment are summarized as follows (in thousands):

	March 31, 2015			December 31, 2014
Furniture and equipment	$	44,215		$	43,659
Leasehold improvements	35,179			35,601
Property and equipment—gross	79,394			79,260
Accumulated depreciation and amortization	(54,135		)	(53,517		)
Property and equipment—net	$	25,259		$	25,743

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Subsequent Event (Notes)

3 Months Ended

Mar. 31, 2015

Subsequent Event [Line Items]

Subsequent Events [Text Block]

Subsequent Event

Management has evaluated subsequent events after the balance sheet date through the financial statements issuance date for appropriate accounting and disclosure.

Acquisition of Welkin Associates, Ltd.

On April 27, 2015, we completed the acquisition of Welkin Associates, Ltd (Welkin), formerly a wholly-owned subsidiary of CSC. We funded the acquisition with cash on hand. Welkin delivers mission-centric services in high-end systems engineering and advanced national security technology and business services. The acquisition strategically positions us to pursue large engineering and support opportunities throughout the intelligence community and Department of Defense. The preliminary purchase price was $34.0 million.

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Commitments and Contingencies (Notes)

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

Commitments and Contingencies

Contracts with the U.S. government, including subcontracts, are subject to extensive legal and regulatory requirements and, from time-to-time, agencies of the U.S. government, in the ordinary course of business, investigate whether our operations are conducted in accordance with these requirements and the terms of the relevant contracts. U.S. government investigations of us, whether related to our U.S. government contracts or conducted for other reasons, could result in administrative, civil, or criminal liabilities, including repayment, fines or penalties being imposed upon us, or could lead to suspension or debarment from future U.S. government contracting activities. Management believes it has adequately reserved for any losses that may be experienced from any investigation of which it is aware. The Defense Contract Audit Agency (DCAA) has completed our incurred cost audits through 2009, with no material adjustments. The remaining audits for 2010 through 2014 are not expected to have a material effect on our financial position, results of operations or cash flow and management believes it has adequately reserved for any losses.

In the normal course of business, we are involved in certain governmental and legal proceedings, claims and disputes and have litigation pending under several suits. We believe that the ultimate resolution of these matters will not have a material effect on our financial position, results of operations or cash flows.

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Goodwill and Other Intangible Assets (Notes)

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets [Text Block]

Goodwill and Other Intangible Assets

There was no change in the carrying amount of goodwill during the three months ended March 31, 2015. The change in the carrying amount of goodwill during the year ended December 31, 2014 is as follows (in thousands):

	Goodwill Balance
Goodwill at December 31, 2013	$	752,867
Acquisitions	98,773
Goodwill at December 31, 2014	$	851,640

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

	March 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Other intangible assets:
Contract and program intangible assets	$	266,272	$	130,570	$	135,702	$	266,272	$	126,619	$	139,653
Capitalized software cost for internal use	35,032		20,428		14,604		35,036		19,500		15,536
Other	115		56		59		115		54		61
Total other intangible assets—net	$	301,419	$	151,054	$	150,365	$	301,423	$	146,173	$	155,250

Amortization expense relating to intangible assets for both the three months endedMarch 31, 2015 and 2014 was $4.9 million. We estimate that we will have the following amortization expense for the future periods indicated below (in thousands):

For the remaining nine months ending December 31, 2015	$	15,018
For the year ending:
December 31, 2016	$	17,858
December 31, 2017	$	15,859
December 31, 2018	$	14,364
December 31, 2019	$	12,509
December 31, 2020	$	11,283

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Debt (Notes)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

Debt

Revolving Credit Facility—We maintain a credit facility with a syndicate of lenders led by Bank of America, N.A, as sole administrative agent. The credit agreement provides for a $500 million revolving credit facility, with a $25 million letter of credit sublimit and a $30 million swing line loan sublimit. The credit agreement also includes an accordion feature that permits us to arrange with the lenders for the provision of additional commitments. On June 13, 2014, we amended and restated the credit agreement, and extended the maturity date to June 13, 2019.

Borrowings under our revolving credit facility are collateralized by substantially all the assets of ManTech and its Material Subsidiaries (as defined in the credit agreement) and bear interest at one of the following variable rates as selected by us at the time of borrowing: a London Interbank Offer Rate (LIBOR) base rate plus market-rate spreads (1.25% to 2.25% based on our consolidated total leverage ratio) or Bank of America's base rate plus market spreads (0.25% to 1.25% based on our consolidated total leverage ratio).

The terms of the credit agreement permit prepayment and termination of the loan commitments at any time, subject to certain conditions. The credit agreement requires us to comply with specified financial covenants, including the maintenance of certain leverage ratios and a certain consolidated coverage ratio. The credit agreement also contains various covenants, including affirmative covenants with respect to certain reporting requirements and maintenance of certain business activities, and negative covenants that, among other things, may limit or impose restrictions on our ability to incur liens, incur additional indebtedness, make investments, make acquisitions and undertake certain other actions. As of March 31, 2015, we were in compliance with the financial covenants under the credit agreement.

There was no outstanding balance on our revolving credit facility at both March 31, 2015 and December 31, 2014. The maximum available borrowing under our revolving credit facility at March 31, 2015 was $499.2 million. As of March 31, 2015, we were contingently liable under letters of credit totaling $0.8 million, which reduced our availability to borrow under our revolving credit facility.

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Stock-Based Compensation (Notes)

3 Months Ended

Mar. 31, 2015

Share-based Compensation [Abstract]

Stock-Based Compensation [Text Block]

Stock-Based Compensation

Our 2011 Management Incentive Plan (the Plan) was designed to attract, retain and motivate key employees. Awards granted under the Plan are settled in shares of Class A common stock. At the beginning of each year, the Plan provides that the number of shares available for issuance automatically increases by an amount equal to 1.5% of the total number of shares of Class A and Class B common stock outstanding on December 31^st of the previous year. On January 2, 2015, there were 560,584 additional shares made available for issuance under the Plan. Through March 31, 2015, the remaining aggregate number of shares of our common stock authorized for issuance under the Plan was 4,702,660. Through March 31, 2015, there were 4,945,818 shares of our Class A common stock that were issued and remain outstanding as a result of equity awards granted under the Plan. The Plan expires in May 2021.

The Plan is administered by the compensation committee of our Board of Directors, along with its delegates. Subject to the express provisions of the Plan, the committee has the Board of Directors’ authority to administer and interpret the Plan, including the discretion to determine the exercise price, vesting schedule, contractual life and the number of shares to be issued.

We recorded $1.2 million of stock-based compensation expense for both of the three months endedMarch 31, 2015 and 2014. No compensation expense of employees with stock awards, including stock-based compensation expense, was capitalized during the periods. For the three months endedMarch 31, 2015 and 2014, the total recognized tax deficiency from the exercise of stock options, vested cancellations and the vesting of restricted stock was $1.5 million and $1.8 million, respectively.

Stock Options—Under the Plan, we have issued stock options. A stock option granted gives the holder the right, but not the obligation, to purchase a certain number of shares at a predetermined price for a specific period of time. During the three months endedMarch 31, 2015 and 2014, we issued options that vest over three years in equal annual installments beginning on the first anniversary of the date of grant and expire five years from the date of grant. Under the terms of the Plan, the contractual life of the option grants may not exceed eight years. The related compensation expense is recognized over the service period and is based on the grant date fair value of the stock and the number of shares expected to vest.

Fair Value Determination—We have used the Black-Scholes-Merton option pricing model to determine fair value of our awards on the date of grant. We will reconsider the use of the Black-Scholes-Merton model if additional information becomes available in the future that indicates another model would be more appropriate or if grants issued in future periods have characteristics that cannot be reasonably estimated under this model.

The following weighted-average assumptions were used for option grants during the three months endedMarch 31, 2015 and 2014:

Volatility—The expected volatility of the options granted was estimated based upon historical volatility of our share price through weekly observations of our trading history.

Expected Term—The expected term of options granted to employees during the three months endedMarch 31, 2015 and 2014 was determined from historical exercises of the grantee population. For all grants valued during the three months endedMarch 31, 2015 and 2014, the options had graded vesting over three years in equal annual installments beginning on the first anniversary of the date of grant and a contractual term of five years.

Risk-free Interest Rate—The yield on zero-coupon U.S. Treasury strips was used to extrapolate a forward-yield curve. This “term structure” of future interest rates was then input into a numeric model to provide the equivalent risk-free rate to be used in the Black-Scholes-Merton model based on the expected term of the underlying grants.

Dividend Yield—The Black-Scholes-Merton valuation model requires an expected dividend yield as an input. We have calculated our expected dividend yield based on an expected annual cash dividend of $0.84 per share.

The following table summarizes weighted-average assumptions used in our calculations of fair value for the three months endedMarch 31, 2015 and 2014:

	Three months ended March 31,
	2015		2014
Volatility	27.16	%	29.86	%
Expected life of options	3 years		3 years
Risk-free interest rate	1.16	%	0.85	%
Dividend yield	3.00	%	3.00	%

Stock Option Activity—The weighted-average fair value of options granted during the three months endedMarch 31, 2015 and 2014, as determined under the Black-Scholes-Merton valuation model, was $5.04 and $4.89, respectively. Option grants that vested during the three months endedMarch 31, 2015 and 2014 had a combined fair value of $1.8 million and $2.6 million, respectively.

The following table summarizes stock option activity for the year ended December 31, 2014 and the three months endedMarch 31, 2015:

	Number of Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Stock options at December 31, 2013	3,400,120		$	35.51	$	4,488
Granted	946,576		$	29.12
Exercised	(158,371	)	$	24.78	$	754
Cancelled and expired	(797,293	)	$	41.75
Stock options at December 31, 2014	3,391,032		$	32.76	$	4,722
Granted	107,340		$	32.53
Exercised	(150,138	)	$	27.66	$	830
Cancelled and expired	(340,449	)	$	46.02
Stock options at March 31, 2015	3,007,785		$	31.50	$	11,505

The following table summarizes non-vested stock options for the three months endedMarch 31, 2015:

	Number of Shares		Weighted Average Fair Value
Non-vested stock options at December 31, 2014	1,673,528		$	4.83
Granted	107,340		$	5.04
Vested	(346,520	)	$	5.07
Cancelled	(51,665	)	$	4.87
Non-vested stock options at March 31, 2015	1,382,683		$	4.78

The following table includes information concerning stock options exercisable and stock options expected to vest at March 31, 2015:

	Number of Shares	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Stock options exercisable	1,625,102	2 years	$	33.90	$	4,231
Stock options expected to vest	1,206,709	4 years	$	28.63	$	6,408
Stock options exercisable and expected to vest	2,831,811

Unrecognized compensation expense related to outstanding stock options expected to vest as of March 31, 2015 was $5.1 million, which is expected to be recognized over a weighted-average period of 2 years and will be adjusted for any future changes in estimated forfeitures.

Restricted Stock—Under the Plan, we have issued restricted stock. A restricted stock award is an issuance of shares that cannot be sold or transferred by the recipient until the vesting period lapses. Restricted stock issued to members of our Board of Directors vests in one year. The related compensation expense is recognized over the service period and is based on the grant date fair value of the stock and the number of shares expected to vest.

Restricted Stock Activity—There was no restricted stock activity during the three months endedMarch 31, 2015. The following table summarizes the restricted stock activity during the year ended December 31, 2014:

	Number of Shares		Weighted Average Fair Value
Non-vested restricted stock at December 31, 2013	21,000
Granted	21,000		$	30.61
Vested	(21,000	)	$	27.65
Non-vested restricted stock at December 31, 2014	21,000

Restricted Stock Units—Under the Plan, we issued restricted stock units (RSUs). RSUs are not actual shares, but rather a right to receive shares in the future based on the level of achievement of performance criteria. The shares are not issued and the employee cannot sell or transfer shares prior to vesting and have no voting rights until the RSUs vest. Employees who are granted RSUs do not receive dividend payments during the service period. The employee’s RSUs will result in the delivery of shares if (a) performance criteria is met and (b) the employee remains employed, in good standing, through the date of the performance period. The performance period is 2 years (January 1, 2015 to December 31, 2016). The grant date fair value of the RSUs is equal to the closing market price of our common stock on the grant date less the present value of dividends expected to be awarded during the service period. We recognize the grant date fair value of RSUs of shares we expect to issue as compensation expense ratably over the requisite service period of March 1, 2015 to December 31, 2016.

Restricted Stock Unit Activity—The following table summarizes the nonvested restricted stock unit activity during the three months endedMarch 31, 2015:

	Number of Shares	Weighted Average Fair Value
Non-vested restricted stock units at December 31, 2014	—
Granted	103,900	$	30.92
Non-vested restricted stock units at March 31, 2015	103,900

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Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 4.9	$ 4.9

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The net income available to common stockholders and weighted average number of common shares outstanding used to compute basic and diluted earnings per share for each class of common stock are as follows (in thousands, except per share amounts):

	Three months ended March 31,
	2015		2014
Distributed earnings	$	7,860	$	7,814
Undistributed earnings	3,898		1,820
Net income	$	11,758	$	9,634
Class A common stock:
Basic net income available to common stockholders	$	7,610	$	6,216
Basic weighted average common shares outstanding	24,206		23,988
Basic earnings per share	$	0.31	$	0.26
Diluted net income available to common stockholders	$	7,627	$	6,222
Effect of potential exercise of stock options	153		69
Diluted weighted average common shares outstanding	24,359		24,057
Diluted earnings per share	$	0.31	$	0.26
Class B common stock:
Basic net income available to common stockholders	$	4,148	$	3,418
Basic weighted average common shares outstanding	13,193		13,193
Basic earnings per share	$	0.31	$	0.26
Diluted net income available to common stockholders	$	4,131	$	3,412
Effect of potential exercise of stock options	—		—
Diluted weighted average common shares outstanding	13,193		13,193
Diluted earnings per share	$	0.31	$	0.26

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Description of the Business (Narrative) (Details)	3 Months Ended
	Mar. 31, 2015 contracts federalagenices
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number Of Federal Agencies	50
Number Of Contracts	1,000

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Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock options, Number of Shares, Period Start	3,391,032	3,400,120	3,400,120
Granted, Number of Shares	107,340		946,576
Exercised, Number of Shares	(150,138)	(24,767)	(158,371)
Cancelled and expired, Number of Shares	(340,449)		(797,293)
Stock options, Number of Shares, Period End	3,007,785		3,391,032
Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock options, Weighted Average Exercise Price, Period Start	$ 32.76	$ 35.51	$ 35.51
Granted, Weighted Average Exercise Price	$ 32.53		$ 29.12
Exercised, Weighted Average Exercise Price	$ 27.66		$ 24.78
Cancelled and expired, Weighted Average Exercise Price	$ 46.02		$ 41.75
Stock options, Weighted Average Exercise Price, Period End	$ 31.50		$ 32.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options, Aggregate Intrinsic Value	$ 11,505		$ 4,722	$ 4,488
Exercised, Aggregate Intrinsic Value	$ 830		$ 754

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
NET INCOME	$ 11,758	$ 9,634
OTHER COMPREHENSIVE LOSS:
Translation adjustments, net of tax	(25)	(13)
COMPREHENSIVE INCOME	$ 11,733	$ 9,621

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Earnings Per Share (Notes)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Earnings Per Share

Under ASC 260, Earnings per Share, the two-class method is an earnings allocation formula that determines earnings per share for each class of common stock according to dividends declared (or accumulated) and participation rights in undistributed earnings. Under that method, basic and diluted earnings per share data are presented for each class of common stock.

In applying the two-class method, we determined that undistributed earnings should be allocated equally on a per share basis between Class A and Class B common stock. Under our Certificate of Incorporation, the holders of the common stock are entitled to participate ratably, on a share-for-share basis as if all shares of common stock were of a single class, in such dividends as may be declared by the Board of Directors. During each of the three months endedMarch 31, 2015 and 2014, we declared and paid one quarterly dividend, in the amount of 0.21 per share, on both classes of common stock.

Basic earnings per share has been computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period. Shares issued during the period and shares reacquired during the period are weighted for the portion of the period in which the shares were outstanding. Diluted earnings per share has been computed in a manner consistent with that of basic earnings per share while giving effect to all potentially dilutive common shares that were outstanding during each period.

The net income available to common stockholders and weighted average number of common shares outstanding used to compute basic and diluted earnings per share for each class of common stock are as follows (in thousands, except per share amounts):

	Three months ended March 31,
	2015		2014
Distributed earnings	$	7,860	$	7,814
Undistributed earnings	3,898		1,820
Net income	$	11,758	$	9,634
Class A common stock:
Basic net income available to common stockholders	$	7,610	$	6,216
Basic weighted average common shares outstanding	24,206		23,988
Basic earnings per share	$	0.31	$	0.26
Diluted net income available to common stockholders	$	7,627	$	6,222
Effect of potential exercise of stock options	153		69
Diluted weighted average common shares outstanding	24,359		24,057
Diluted earnings per share	$	0.31	$	0.26
Class B common stock:
Basic net income available to common stockholders	$	4,148	$	3,418
Basic weighted average common shares outstanding	13,193		13,193
Basic earnings per share	$	0.31	$	0.26
Diluted net income available to common stockholders	$	4,131	$	3,412
Effect of potential exercise of stock options	—		—
Diluted weighted average common shares outstanding	13,193		13,193
Diluted earnings per share	$	0.31	$	0.26

For the three months endedMarch 31, 2015 and 2014, options to purchase 2.0 million and 2.8 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because the options’ effect would have been anti-dilutive. For the three months endedMarch 31, 2015 and 2014, shares issued from the exercise of stock options were 150,138 and 24,767, respectively.

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Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
7Delta Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed		$ 0.2
Business Combination, Consideration Transferred			81.4
Business Acquisition, Goodwill, Expected Tax Deductible Amount	70.0
Expected Goodwill Tax Amortization Period	15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
7Delta Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	4.8
Finite-Lived Intangible Asset, Useful Life	10 years
7Delta Inc. [Member] | Backlog [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	2.9
Finite-Lived Intangible Asset, Useful Life	2 years
Allied Technology Group, Inc [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed		0.2
Business Combination, Consideration Transferred			45.0
Business Acquisition, Goodwill, Expected Tax Deductible Amount	28.8
Expected Goodwill Tax Amortization Period	15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	18 years
Allied Technology Group, Inc [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	6.4
Finite-Lived Intangible Asset, Useful Life	20 years
Allied Technology Group, Inc [Member] | Backlog [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 0.6
Finite-Lived Intangible Asset, Useful Life	1 year

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Debt (Revolving Credit Facility) (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Bank of America Syndicate [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000,000
Line of Credit, Current	0	0
Line of Credit Facility, Remaining Borrowing Capacity	499,200,000
Bank of America Syndicate [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	25,000,000
Contingent Liability under Letters of Credit	800,000
Bank of America Syndicate [Member] | Revolving Credit Facility, Swing Line Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	30,000,000
Variable Spread [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Variable Spread [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Variable Spread [Member] | Bank of America's Base Rate [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Variable Spread [Member] | Bank of America's Base Rate [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2015

7Delta Inc. [Member]

Business Combination Segment Allocation [Line Items]

Schedule of Purchase Price Allocations [Table Text Block]

The following table represents purchase price allocation for 7Delta (in thousands):

	7Delta Inc.
Cash and cash equivalents	$	1,408
Receivables	9,664
Prepaid expenses and other	175
Goodwill	69,967
Other intangible assets	7,762
Property and equipment	597
Other assets	39
Accounts payable and accrued expenses	(6,617		)
Accrued salaries and related expenses	(1,399		)
Billings in excess of revenue earned	(229		)
Net assets acquired and liabilities assumed	$	81,367

Allied Technology Group, Inc [Member]

Business Combination Segment Allocation [Line Items]

Schedule of Purchase Price Allocations [Table Text Block]

The following table represents the purchase price allocation for ATG (in thousands):

	Allied Technology Group, Inc.
Cash and cash equivalents	$	712
Receivables	11,670
Prepaid expenses and other	1,432
Contractual inventory	1
Goodwill	28,806
Other intangible assets	7,071
Property and equipment	899
Other assets	111
Accounts payable and accrued expenses	(3,399		)
Accrued salaries and related expenses	(2,155		)
Billings in excess of revenue earned	(148		)
Net assets acquired and liabilities assumed	$	45,000