Mantech International (MANT) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2017	Aug. 02, 2017
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	MANT
Entity Registrant Name	MANTECH INTERNATIONAL CORP
Entity Central Index Key	892,537
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		25,696,363
Class B common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		13,190,745

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 108,210	$ 64,936
Receivables—net	318,128	320,677
Prepaid expenses and other	30,771	34,423
Contractual inventory	2,515	1,277
Total Current Assets	459,624	421,313
Goodwill	955,874	955,874
Other intangible assets—net	146,318	154,931
Employee supplemental savings plan assets	31,455	29,383
Property and equipment—net	23,595	23,121
Investments	11,808	11,691
Other assets	2,199	2,151
TOTAL ASSETS	1,630,873	1,598,464
LIABILITIES
Accounts payable and accrued expenses	104,143	108,888
Accrued salaries and related expenses	78,585	70,768
Billings in excess of revenue earned	13,948	11,998
Total Current Liabilities	196,676	191,654
Deferred income taxes	129,960	122,081
Accrued retirement	31,081	30,581
Other long-term liabilities	11,721	12,481
TOTAL LIABILITIES	369,438	356,797
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Additional paid-in capital	477,545	471,906
Treasury stock	(9,158)	(9,158)
Retained earnings	792,883	778,710
Accumulated other comprehensive loss	(226)	(181)
TOTAL STOCKHOLDERS’ EQUITY	1,261,435	1,241,667
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,630,873	1,598,464
Class A common stock
STOCKHOLDERS' EQUITY
Common stock	259	258
Class B common stock
STOCKHOLDERS' EQUITY
Common stock	$ 132	$ 132

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets Parentheticals - $ / shares	Jun. 30, 2017	Dec. 31, 2016
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	25,922,608	25,795,973
Common stock, Shares outstanding	25,678,495	25,551,860
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	13,190,745	13,190,745
Common stock, Shares outstanding	13,190,745	13,190,745

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
REVENUES	$ 413,694	$ 401,354	$ 832,068	$ 792,016
Cost of services	350,674	341,511	707,721	675,025
General and administrative expenses	38,085	35,629	75,022	70,832
OPERATING INCOME	24,935	24,214	49,325	46,159
Interest expense	(317)	(306)	(611)	(595)
Interest income	28	19	52	63
Other income (expense), net	5	45	44	53
INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS	24,651	23,972	48,810	45,680
Provision for income taxes	(9,126)	(9,250)	(18,226)	(17,810)
Equity in gains of unconsolidated subsidiaries	36	60	5	128
NET INCOME	$ 15,561	$ 14,782	$ 30,589	$ 27,998
Class A common stock
BASIC EARNINGS PER SHARE:
Basic earnings per share	$ 0.40	$ 0.39	$ 0.79	$ 0.74
DILUTED EARNINGS PER SHARE:
Diluted earnings per share	0.40	0.39	0.78	0.74
Class B common stock
BASIC EARNINGS PER SHARE:
Basic earnings per share	0.40	0.39	0.79	0.74
DILUTED EARNINGS PER SHARE:
Diluted earnings per share	$ 0.40	$ 0.39	$ 0.78	$ 0.74

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
NET INCOME	$ 15,561	$ 14,782	$ 30,589	$ 27,998
OTHER COMPREHENSIVE INCOME (LOSS):
Translation adjustments, net of tax	9	4	(45)	4
COMPREHENSIVE INCOME	$ 15,570	$ 14,786	$ 30,544	$ 28,002

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 30,589,000	$ 27,998,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,522,000	15,150,000
Deferred income taxes	7,951,000	9,090,000
Stock-based compensation	2,256,000	1,291,000
Equity in gains of unconsolidated subsidiaries	(5,000)	(128,000)
Excess tax benefits from exercise of stock options	0	(421,000)
Change in assets and liabilities—net of effects from acquired businesses:
Receivables—net	2,491,000	5,149,000
Prepaid expenses and other	3,769,000	(830,000)
Contractual inventory	(1,238,000)	0
Employee supplemental savings plan asset	(2,072,000)	(590,000)
Accounts payable and accrued expenses	(4,718,000)	(10,679,000)
Accrued salaries and related expenses	7,809,000	3,724,000
Billings in excess of revenue earned	1,624,000	2,619,000
Accrued retirement	500,000	(1,617,000)
Other	(1,174,000)	430,000
Net cash flow from operating activities	63,304,000	51,186,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(4,385,000)	(3,346,000)
Investment in capitalized software for internal use	(2,537,000)	(740,000)
Proceeds from previous acquisition	112,000	0
Payments to acquire investments	(110,000)	(201,000)
Acquisition of businesses—net of cash acquired	0	(47,682,000)
Net cash flow from investing activities	(6,920,000)	(51,969,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(16,308,000)	(15,927,000)
Proceeds from exercise of stock options	3,198,000	15,092,000
Excess tax benefits from exercise of stock options	0	421,000
Net cash flow from financing activities	(13,110,000)	(414,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	43,274,000	(1,197,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	64,936,000	41,314,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	108,210,000	40,117,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes, net	986,000	5,618,000
Cash paid for interest	488,000	490,000
Noncash investing and financing activities:
Capital expenditures incurred but not yet paid	$ 141,000	$ 0

Description of the Business (No

Description of the Business (Notes)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business [Text Block]	Description of the Business We provide 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 Investigations (FBI); the health and space community; and other U.S. government customers. Our expertise includes cybersecurity; software and systems development; enterprise information technology; multi-disciplined intelligence; command, control, communications, computers, intelligence, surveillance and reconnaissance; program protection and mission assurance; systems engineering; supply chain management and logistics; test and evaluation; training; and management consulting. Additional information can be found at www.mantech.com.

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation [Text Block]	Basis of Presentation The accompanying 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 U.S., have been condensed or omitted pursuant to those rules and regulations. 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. We recommend that you read these 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, 2016 , previously filed with the SEC. We believe that the 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.

Acquisitions (Notes)

Acquisitions (Notes)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions [Text Block]	Acquisitions Edaptive Systems LLC (Edaptive) —On December 15, 2016 , we completed the acquisition of Edaptive. The results of Edaptive's operations have been included in our condensed consolidated financial statements since that date. The acquisition was completed through a membership interest purchase agreement dated December 15, 2016 , by and among Edaptive, Everest Holdco, Inc., and certain members of Edaptive and ManTech Advanced Systems International, Inc. Edaptive provides innovative information technology (IT) solutions primarily to federal health agencies, with a significant focus on the Centers for Medicare & Medicaid Services. The acquisition strategically expands our reach within the federal health community. We funded the acquisition with cash on hand. The membership interest purchase agreement did not contain provisions for contingent consideration. The purchase price of $13.2 million was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The goodwill recorded related to this transaction will be deductible for tax purposes over 15 years . Recognition of goodwill is largely attributed to the value paid for Edaptive's capabilities to support Department of Health and Human Services customers and, specifically, in agile software development, testing and automation and business intelligence. In allocating the purchase price, we considered, among other factors, analysis of historical financial performance and estimates of future performance of Edaptive's contracts. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $1.1 million and $0.3 million , respectively. Customer contracts and related relationships represent the underlying relationships and agreements with Edaptive'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 1 year . The weighted-average amortization period for the intangible assets is 8 years . The following table represents the purchase price allocation for Edaptive (in thousands): Cash and cash equivalents $ 1,955 Receivables 10,892 Prepaid expenses and other 261 Goodwill 6,193 Other intangible assets 1,689 Property and equipment 502 Other assets 116 Accounts payable and accrued expenses (5,777 ) Accrued salaries and related expenses (2,324 ) Billings in excess of revenue earned (326 ) Net assets acquired and liabilities assumed $ 13,181 We have not disclosed current period, nor pro forma, revenues and earnings attributable to Edaptive as our integration of these operations post-acquisition and the entity's accounting methods pre-acquisition make it impracticable.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share Under Accounting Standards Codification (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 six months ended June 30, 2017 and 2016 , we declared and paid quarterly dividends 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 shares of common stock 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 have 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 Six months ended 2017 2016 2017 2016 Distributed earnings $ 8,161 $ 8,004 $ 16,301 $ 15,918 Undistributed earnings 7,400 6,778 14,288 12,080 Net income $ 15,561 $ 14,782 $ 30,589 $ 27,998 Class A common stock: Basic net income available to common stockholders $ 10,272 $ 9,635 $ 20,183 $ 18,223 Basic weighted average common shares outstanding 25,618 24,707 25,583 24,591 Basic earnings per share $ 0.40 $ 0.39 $ 0.79 $ 0.74 Diluted net income available to common stockholders $ 10,300 $ 9,662 $ 20,242 $ 18,261 Effect of potential exercise of stock options 209 209 220 150 Diluted weighted average common shares outstanding 25,827 24,916 25,803 24,741 Diluted earnings per share $ 0.40 $ 0.39 $ 0.78 $ 0.74 Class B common stock: Basic net income available to common stockholders $ 5,289 $ 5,147 $ 10,406 $ 9,775 Basic weighted average common shares outstanding 13,191 13,192 13,191 13,192 Basic earnings per share $ 0.40 $ 0.39 $ 0.79 $ 0.74 Diluted net income available to common stockholders $ 5,261 $ 5,120 $ 10,347 $ 9,737 Effect of potential exercise of stock options — — — — Diluted weighted average common shares outstanding 13,191 13,192 13,191 13,192 Diluted earnings per share $ 0.40 $ 0.39 $ 0.78 $ 0.74 For the three months ended June 30, 2017 and 2016 , options to purchase 381,987 shares and 130,276 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 six months ended June 30, 2017 and 2016 , options to purchase 270,649 shares and 701,113 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 six months ended June 30, 2017 and 2016 , there were 102,936 shares and 525,212 shares, respectively, issued from the exercise of stock options.

Receivables (Notes)

Receivables (Notes)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Receivables [Text Block]	Receivables We deliver a broad array of IT 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): June 30, December 31, Billed receivables $ 249,940 $ 247,114 Unbilled receivables: Amounts billable 46,098 52,640 Revenues recorded in excess of funding 15,900 20,078 Retainage 13,695 8,353 Allowance for doubtful accounts (7,505 ) (7,508 ) Receivables—net $ 318,128 $ 320,677 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. Accounts receivable at June 30, 2017 are expected to be substantially collected within one year except for approximately $1.2 million , of which 97.2% is related to receivables from 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. The allowance for doubtful accounts represents our estimate for exposure to compliance, contractual issues and bad debts related to prime contractors.

Property and Equipment (Notes)

Property and Equipment (Notes)	6 Months Ended
	Jun. 30, 2017
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): June 30, December 31, Furniture and equipment $ 54,458 $ 51,806 Leasehold improvements 38,362 36,439 Property and equipment—gross 92,820 88,245 Accumulated depreciation and amortization (69,225 ) (65,124 ) Property and equipment—net $ 23,595 $ 23,121

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets (Notes)	6 Months Ended
	Jun. 30, 2017
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 six months ended June 30, 2017 . The change in the carrying amount of goodwill during the year ended December 31, 2016 is as follows (in thousands): Goodwill Balance Goodwill at December 31, 2015 $ 919,591 Acquisitions 36,283 Goodwill at December 31, 2016 $ 955,874 Other intangible assets consisted of the following (in thousands): June 30, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Other intangible assets: Contract and program intangible assets $ 301,082 $ 168,264 $ 132,818 $ 301,082 $ 158,671 $ 142,411 Capitalized software cost for internal use 41,823 28,323 13,500 39,332 26,815 12,517 Other 58 58 — 58 55 3 Total other intangible assets—net $ 342,963 $ 196,645 $ 146,318 $ 340,472 $ 185,541 $ 154,931 Amortization expense relating to intangible assets for the three months ended June 30, 2017 and 2016 was $5.5 million and $5.3 million , respectively. Amortization expense relating to intangible assets for the six months ended June 30, 2017 and 2016 was $11.1 million and $10.7 million , respectively. We estimate that we will have the following amortization expense for the future periods indicated below (in thousands): For the remaining six months ending December 31, 2017 $ 11,454 For the year ending: December 31, 2018 $ 19,921 December 31, 2019 $ 17,370 December 31, 2020 $ 15,076 December 31, 2021 $ 12,986 December 31, 2022 $ 11,207

Debt (Notes)

Debt (Notes)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt [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 $50 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. The maturity date is June 13, 2019 . Borrowings under our credit agreement are collateralized by substantially all of our assets and our 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 based 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 maintaining 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 and during the six months ended June 30, 2017 and 2016 , we were in compliance with the financial covenants under the credit agreement. There was no outstanding balance on our revolving credit facility at both June 30, 2017 and December 31, 2016 . The maximum available borrowing under the revolving credit facility at June 30, 2017 was $480.7 million . As of June 30, 2017 , we were contingently liable under letters of credit totaling $19.3 million , which reduces our availability to borrow under our revolving credit facility.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [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 repayments, 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 has substantially completed our incurred cost audits through 2012 with no material adjustments. The remaining audits for 2013 through 2016 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, except for the matter noted below. We are a defendant in a lawsuit filed by two former employees alleging retaliation under both the False Claims Act (FCA) and the Defense Contractor Whistleblower Protection Act (DCWPA). In November 2016, we went to trial and the jury returned a verdict in favor of both plaintiffs, finding us liable for retaliation under both the FCA and the DCWPA, and awarded $0.8 million in compensatory damages for emotional distress. As a result of the jury's verdict, these plaintiffs are also entitled to awards of (i) back pay, (ii) front pay and (iii) attorney’s fees and costs. We challenged the jury’s verdict at the trial court level - both in terms of liability and in terms of the amount of the compensatory damages awarded. Specifically, we have asked the trial judge to: (i) grant us judgment as a matter of law and dismiss the retaliation claims under both the FCA and the DCWPA, and (ii) vacate the jury’s awards of compensatory damages. On May 19, 2017, the court, by a Memorandum Opinion and Order, vacated the jury's verdict with respect to the awards of $0.8 million in compensatory damages for emotional distress and awarded damages in the total amount of $1.8 million for back pay and front pay. Interest and attorney's fees were also awarded and the amount will be determined at a later date. We filed an appeal in the Fourth Circuit Court of Appeals. As of June 30, 2017 , we adjusted a related liability and receivable to $2.6 million . Through the appeals process, our liability could be further reduced or, if the plaintiffs are successful, increased an additional $0.8 million . We have an insurance policy that covers the amount of the liability, therefore, there was no loss recognized as of the period ended June 30, 2017 . We determined that it is remote that future events will result in financial statement losses. We have $19.3 million outstanding on our letter of credit, of which $15.2 million is related to an outstanding performance bond in connection with a contract between ManTech MENA, LLC and Jadwalean International Operations and Management Company to fulfill technical support requirements for the Royal Saudi Air Force.

Stock-Based Compensation (Notes

Stock-Based Compensation (Notes)	6 Months Ended
	Jun. 30, 2017
Share-based Compensation [Abstract]
Stock-Based Compensation [Text Block]	Stock-Based Compensation Our 2016 Management Incentive Plan (the Plan) was designed to attract, retain and motivate key employees. The types of awards available under the Plan include stock options, restricted stock and restricted stock units (RSUs). Equity 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, 2017 , there were 581,139 additional shares made available for issuance under the Plan. Through June 30, 2017 , the Board of Directors has authorized the issuance of up to 13,963,435 shares under this Plan. Through June 30, 2017 , the remaining aggregate number of shares of our common stock available for future grants under the Plan was 6,220,389 . The Plan expires in March 2026 . 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. On January 1, 2017, we adopted Accounting Standards Update (ASU) 2016-09, Compensation - Stock Compensation (Topic 718) , which simplifies several aspects of the accounting for employee share-based payment transactions. All excess tax benefits (deficiencies) will be recognized as income tax expense (benefit) in the condensed consolidated income statement. For the six months ended June 30, 2017 , we recorded $(0.1) million to income tax expense for tax benefits related to the exercise of stock options, vested cancellations and the vesting of restricted stock. For the six months ended June 30, 2016 , we recorded $1.2 million to paid in capital related to tax deficiencies from the exercise of stock options, vested cancellations and the vesting of restricted stock. The ASU eliminates the requirement to estimate forfeitures. We have elected to account for forfeitures when they occur. Upon transition we recognized a cumulative-effect adjustment to retained earnings of $0.2 million related to previously estimated forfeitures. Excess tax benefits no longer represent financing activities as they are recognized in the income statement; therefore, excess tax benefits are not separate cash flows and will be classified as operating activities in the same manner as other cash flows related to income taxes. The ASU eliminates the requirement to reclassify excess tax benefits from operating activities to financing activities. The change in the presentation of the cash flows was applied prospectively starting January 1, 2017. Therefore, prior periods were not adjusted. Furthermore, there was no effect on the condensed consolidated statement of cash flows related to statutory tax withholding requirements on prior periods because we do not withhold shares from an employee's award for tax-withholding purposes. Stock Compensation Expense —For the three months ended June 30, 2017 and 2016 , we recorded $1.3 million and $0.2 million of stock-based compensation expense, respectively. For the six months ended June 30, 2017 and 2016 , we recorded $2.3 million and $1.3 million of stock-based compensation expense, respectively. No compensation expense of employees with stock awards, including stock-based compensation expense, was capitalized during the periods. 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. We typically issue options that vest over three years in equal installments beginning on the first anniversary of the date of grant. Under the terms of the Plan, the contractual life of the option grants may not exceed eight years . During the six months ended June 30, 2017 and 2016 , we issued options that expire five years from the date of grant. Fair Value Determination —We have used the Black-Scholes-Merton option pricing model to determine the 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 six months ended June 30, 2017 and 2016 : • 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 life of options —The expected life of options granted to employees was determined from historical exercises of the grantee population. The options had graded vesting over three years in equal 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 six months ended June 30, 2017 and 2016 : Six months ended 2017 2016 Volatility 25.12 % 23.66 % Expected life of options 3 years 3 years Risk-free interest rate 1.67 % 1.20 % Dividend yield 2.75 % 3.00 % Stock Option Activity —The weighted-average fair value of options granted during the six months ended June 30, 2017 and 2016 , as determined under the Black-Scholes-Merton valuation model, was $5.63 and $3.99 , respectively. Option grants that vested during the six months ended June 30, 2017 and 2016 had a combined fair value of $0.8 million and $1.4 million , respectively. The following table summarizes stock option activity for the year ended December 31, 2016 and the six months ended June 30, 2017 : Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Stock options outstanding at December 31, 2015 2,495,310 $ 30.86 $ 3,583 Granted 199,938 $ 34.22 Exercised (1,045,789 ) $ 29.24 $ 8,858 Cancelled and expired (489,040 ) $ 37.91 Stock options outstanding at December 31, 2016 1,160,419 $ 29.93 $ 14,299 Granted 265,865 $ 36.87 Exercised (102,936 ) $ 31.15 $ 690 Cancelled and expired (32,871 ) $ 32.88 Stock options outstanding at June 30, 2017 1,290,477 $ 31.19 $ 13,156 3 years Stock options exercisable at June 30, 2017 656,654 $ 28.53 $ 8,441 2 years The following table summarizes non-vested stock options for the six months ended June 30, 2017 : Number of Shares Weighted Average Fair Value Non-vested stock options at December 31, 2016 562,927 $ 4.66 Granted 265,865 $ 5.63 Vested (175,348 ) $ 4.79 Cancelled (19,621 ) $ 4.81 Non-vested stock options at June 30, 2017 633,823 $ 5.03 Unrecognized compensation expense related to non-vested awards was $2.4 million as of June 30, 2017 , which is expected to be recognized over a weighted-average period of 2 years . 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. The grant date fair value of the restricted stock is equal to the closing market price of our common stock on the date of grant. Restricted Stock Activity —The following table summarizes the restricted stock activity during the year ended December 31, 2016 and the six months ended June 30, 2017 : Number of Shares Weighted Average Fair Value Non-vested restricted stock at December 31, 2015 21,000 $ 28.98 Granted 18,000 $ 33.84 Vested (21,000 ) $ 28.98 Non-vested restricted stock at December 31, 2016 18,000 $ 33.84 Granted 24,000 $ 37.90 Vested (18,000 ) $ 33.84 Non-vested restricted stock at June 30, 2017 24,000 $ 37.90 RSUs —Under the Plan, we have issued RSUs. RSUs are not actual shares, but rather a right to receive shares in the future. 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 vesting period. Generally, our employees are granted performance-based RSUs. These RSUs will result in the delivery of shares only 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 two years . In addition, in 2016 we granted 26,788 time-based RSUs to an officer, which do not contain performance criteria (half will vest four years after the date of grant and the other half will vest five years after the date of grant). 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. RSU Activity —The following table summarizes the non-vested RSU activity during the year ended December 31, 2016 and the six months ended June 30, 2017 : Number of Units Weighted Average Fair Value Non-vested RSUs at December 31, 2015 93,450 $ 30.84 Granted 132,988 $ 29.50 Cancelled and expired (20,100 ) $ 29.56 Non-vested RSUs at December 31, 2016 206,338 $ 30.10 Granted 55,380 $ 35.31 Cancelled and expired (87,125 ) $ 30.80 Non-vested RSUs at June 30, 2017 174,593 $ 31.41

Business Segment and Geographic

Business Segment and Geographic Area Information (Notes)	6 Months Ended
	Jun. 30, 2017
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 IT 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% and 98% of our revenues for the six months ended June 30, 2017 and 2016 , respectively. We treat sales to U.S. government customers as sales within the U.S. regardless of where the services are performed. U.S. revenues were approximately 98% and 98% of our total revenues for the three months ended June 30, 2017 and 2016 , respectively. U.S. revenues were approximately 98% and 99% of our total revenues for the six months ended June 30, 2017 and 2016 , respectively. International revenues were approximately 2% and 2% of our total revenues for the three months ended June 30, 2017 and 2016 , respectively. International revenues were approximately 2% and 1% of our total revenues for the six months ended June 30, 2017 and 2016 , respectively. Furthermore, substantially all assets from continuing operations were held in the U.S. for the six months ended June 30, 2017 and year ended December 31, 2016 .

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2017
Edaptive Systems LLC [Member]
Business Combination Segment Allocation [Line Items]
Schedule of Purchase Price Allocations [Table Text Block]	The following table represents the purchase price allocation for Edaptive (in thousands): Cash and cash equivalents $ 1,955 Receivables 10,892 Prepaid expenses and other 261 Goodwill 6,193 Other intangible assets 1,689 Property and equipment 502 Other assets 116 Accounts payable and accrued expenses (5,777 ) Accrued salaries and related expenses (2,324 ) Billings in excess of revenue earned (326 ) Net assets acquired and liabilities assumed $ 13,181

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
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 Six months ended 2017 2016 2017 2016 Distributed earnings $ 8,161 $ 8,004 $ 16,301 $ 15,918 Undistributed earnings 7,400 6,778 14,288 12,080 Net income $ 15,561 $ 14,782 $ 30,589 $ 27,998 Class A common stock: Basic net income available to common stockholders $ 10,272 $ 9,635 $ 20,183 $ 18,223 Basic weighted average common shares outstanding 25,618 24,707 25,583 24,591 Basic earnings per share $ 0.40 $ 0.39 $ 0.79 $ 0.74 Diluted net income available to common stockholders $ 10,300 $ 9,662 $ 20,242 $ 18,261 Effect of potential exercise of stock options 209 209 220 150 Diluted weighted average common shares outstanding 25,827 24,916 25,803 24,741 Diluted earnings per share $ 0.40 $ 0.39 $ 0.78 $ 0.74 Class B common stock: Basic net income available to common stockholders $ 5,289 $ 5,147 $ 10,406 $ 9,775 Basic weighted average common shares outstanding 13,191 13,192 13,191 13,192 Basic earnings per share $ 0.40 $ 0.39 $ 0.79 $ 0.74 Diluted net income available to common stockholders $ 5,261 $ 5,120 $ 10,347 $ 9,737 Effect of potential exercise of stock options — — — — Diluted weighted average common shares outstanding 13,191 13,192 13,191 13,192 Diluted earnings per share $ 0.40 $ 0.39 $ 0.78 $ 0.74

Receivables (Tables)

Receivables (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Schedule of Contract Receivables [Table Text Block]	The components of contract receivables are as follows (in thousands): June 30, December 31, Billed receivables $ 249,940 $ 247,114 Unbilled receivables: Amounts billable 46,098 52,640 Revenues recorded in excess of funding 15,900 20,078 Retainage 13,695 8,353 Allowance for doubtful accounts (7,505 ) (7,508 ) Receivables—net $ 318,128 $ 320,677

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment [Table Text Block]	Major classes of property and equipment are summarized as follows (in thousands): June 30, December 31, Furniture and equipment $ 54,458 $ 51,806 Leasehold improvements 38,362 36,439 Property and equipment—gross 92,820 88,245 Accumulated depreciation and amortization (69,225 ) (65,124 ) Property and equipment—net $ 23,595 $ 23,121

Goodwill and Other Intangible22

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
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, 2016 is as follows (in thousands): Goodwill Balance Goodwill at December 31, 2015 $ 919,591 Acquisitions 36,283 Goodwill at December 31, 2016 $ 955,874
Schedule of Other Intangible Assets [Table Text Block]	Other intangible assets consisted of the following (in thousands): June 30, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Other intangible assets: Contract and program intangible assets $ 301,082 $ 168,264 $ 132,818 $ 301,082 $ 158,671 $ 142,411 Capitalized software cost for internal use 41,823 28,323 13,500 39,332 26,815 12,517 Other 58 58 — 58 55 3 Total other intangible assets—net $ 342,963 $ 196,645 $ 146,318 $ 340,472 $ 185,541 $ 154,931
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 six months ending December 31, 2017 $ 11,454 For the year ending: December 31, 2018 $ 19,921 December 31, 2019 $ 17,370 December 31, 2020 $ 15,076 December 31, 2021 $ 12,986 December 31, 2022 $ 11,207

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
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 six months ended June 30, 2017 and 2016 : Six months ended 2017 2016 Volatility 25.12 % 23.66 % Expected life of options 3 years 3 years Risk-free interest rate 1.67 % 1.20 % Dividend yield 2.75 % 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, 2016 and the six months ended June 30, 2017 : Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Stock options outstanding at December 31, 2015 2,495,310 $ 30.86 $ 3,583 Granted 199,938 $ 34.22 Exercised (1,045,789 ) $ 29.24 $ 8,858 Cancelled and expired (489,040 ) $ 37.91 Stock options outstanding at December 31, 2016 1,160,419 $ 29.93 $ 14,299 Granted 265,865 $ 36.87 Exercised (102,936 ) $ 31.15 $ 690 Cancelled and expired (32,871 ) $ 32.88 Stock options outstanding at June 30, 2017 1,290,477 $ 31.19 $ 13,156 3 years Stock options exercisable at June 30, 2017 656,654 $ 28.53 $ 8,441 2 years
Schedule of Non-vested Share Activity [Table Text Block]	The following table summarizes non-vested stock options for the six months ended June 30, 2017 : Number of Shares Weighted Average Fair Value Non-vested stock options at December 31, 2016 562,927 $ 4.66 Granted 265,865 $ 5.63 Vested (175,348 ) $ 4.79 Cancelled (19,621 ) $ 4.81 Non-vested stock options at June 30, 2017 633,823 $ 5.03
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, 2016 and the six months ended June 30, 2017 : Number of Shares Weighted Average Fair Value Non-vested restricted stock at December 31, 2015 21,000 $ 28.98 Granted 18,000 $ 33.84 Vested (21,000 ) $ 28.98 Non-vested restricted stock at December 31, 2016 18,000 $ 33.84 Granted 24,000 $ 37.90 Vested (18,000 ) $ 33.84 Non-vested restricted stock at June 30, 2017 24,000 $ 37.90
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 non-vested RSU activity during the year ended December 31, 2016 and the six months ended June 30, 2017 : Number of Units Weighted Average Fair Value Non-vested RSUs at December 31, 2015 93,450 $ 30.84 Granted 132,988 $ 29.50 Cancelled and expired (20,100 ) $ 29.56 Non-vested RSUs at December 31, 2016 206,338 $ 30.10 Granted 55,380 $ 35.31 Cancelled and expired (87,125 ) $ 30.80 Non-vested RSUs at June 30, 2017 174,593 $ 31.41

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - Edaptive Systems LLC [Member] $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 13.2
Expected Goodwill Tax Amortization Period	15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 1.1
Finite-Lived Intangible Asset, Useful Life	10 years
Backlog [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 0.3
Finite-Lived Intangible Asset, Useful Life	1 year

Acquisitions (Schedule of Purch

Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 955,874	$ 955,874	$ 919,591
Edaptive Systems LLC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	1,955
Receivables	10,892
Prepaid expenses and other	261
Goodwill	6,193
Other intangible assets	1,689
Property and equipment	502
Other assets	116
Accounts payable and accrued expenses	(5,777)
Accrued salaries and related expenses	(2,324)
Billings in excess of revenue earned	(326)
Net assets acquired and liabilities assumed	$ 13,181

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - $ / shares	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Earnings Per Share [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.21	$ 0.21	$ 0.21	$ 0.21
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	381,987		130,276		270,649	701,113
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					102,936	525,212	1,045,789

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of Earnings Per Share, Basic and Diluted [Line Items]
Distributed earnings	$ 8,161	$ 8,004	$ 16,301	$ 15,918
Undistributed earnings	7,400	6,778	14,288	12,080
Net income	15,561	14,782	30,589	27,998
Class A common stock
Components of Earnings Per Share, Basic and Diluted [Line Items]
Basic net income available to common stockholders	$ 10,272	$ 9,635	$ 20,183	$ 18,223
Basic weighted average common shares outstanding	25,618,000	24,707,000	25,583,000	24,591,000
Basic earnings per share	$ 0.40	$ 0.39	$ 0.79	$ 0.74
Diluted net income available to common stockholders	$ 10,300	$ 9,662	$ 20,242	$ 18,261
Effect of potential exercise of stock options	209,000	209,000	220,000	150,000
Diluted weighted average common shares outstanding	25,827,000	24,916,000	25,803,000	24,741,000
Diluted earnings per share	$ 0.40	$ 0.39	$ 0.78	$ 0.74
Class B common stock
Components of Earnings Per Share, Basic and Diluted [Line Items]
Basic net income available to common stockholders	$ 5,289	$ 5,147	$ 10,406	$ 9,775
Basic weighted average common shares outstanding	13,191,000	13,192,000	13,191,000	13,192,000
Basic earnings per share	$ 0.40	$ 0.39	$ 0.79	$ 0.74
Diluted net income available to common stockholders	$ 5,261	$ 5,120	$ 10,347	$ 9,737
Effect of potential exercise of stock options	0	0	0	0
Diluted weighted average common shares outstanding	13,191,000	13,192,000	13,191,000	13,192,000
Diluted earnings per share	$ 0.40	$ 0.39	$ 0.78	$ 0.74

Receivables (Schedule of Contra

Receivables (Schedule of Contract Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Billed receivables	$ 249,940	$ 247,114
Unbilled receivables:
Amounts billable	46,098	52,640
Revenues recorded in excess of funding	15,900	20,078
Retainage	13,695	8,353
Allowance for doubtful accounts	(7,505)	(7,508)
Receivables—net	$ 318,128	$ 320,677

Receivables (Narrative) (Detail

Receivables (Narrative) (Details) $ in Millions	Jun. 30, 2017USD ($)
Receivables [Abstract]
Accounts Receivable Not Expected to be Substantially Collected within One Year	$ 1.2
Percentage of Accounts Receivable Not Expected to be Collected Within One Year related to Receivables from Direct Sales to U.S. Government	97.20%

Property and Equipment (Propert

Property and Equipment (Property and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment—gross	$ 92,820	$ 88,245
Accumulated depreciation and amortization	(69,225)	(65,124)
Property and equipment—net	23,595	23,121
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment—gross	54,458	51,806
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—gross	$ 38,362	$ 36,439

Goodwill and Other Intangible31

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 5.5	$ 5.3	$ 11.1	$ 10.7

Goodwill and Other Intangible32

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Goodwill [Roll Forward]
Goodwill, period start	$ 919,591
Acquisitions	36,283
Goodwill, period end	$ 955,874

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 342,963,000	$ 340,472,000
Accumulated Amortization	196,645,000	185,541,000
Net Carrying Amount	146,318,000	154,931,000
Contract and program intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	301,082,000	301,082,000
Accumulated Amortization	168,264,000	158,671,000
Net Carrying Amount	132,818,000	142,411,000
Capitalized software cost for internal use
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	41,823,000	39,332,000
Accumulated Amortization	28,323,000	26,815,000
Net Carrying Amount	13,500,000	12,517,000
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	58,000	58,000
Accumulated Amortization	58,000	55,000
Net Carrying Amount	$ 0	$ 3,000

Goodwill and Other Intangible34

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets, Future Amortization Expense) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
For the remaining six months ending December 31, 2017	$ 11,454
For the year ending:
December 31, 2018	19,921
December 31, 2019	17,370
December 31, 2020	15,076
December 31, 2021	12,986
December 31, 2022	$ 11,207

Debt (Revolving Credit Facility

Debt (Revolving Credit Facility) (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
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	480,700,000
Bank of America Syndicate [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000
Contingent Liability under Letters of Credit	19,300,000
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
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%
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%
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%
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%

Commitments and Contingencies36

Commitments and Contingencies (Pending Litigation) (Narrative) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Damages Awarded, Value	$ 1,800,000	$ 800,000
Loss Contingency Accrual	2,600,000
Loss Contingency, Receivable	2,600,000
Loss Contingency, Range of Possible Loss, Portion Not Accrued	800,000
Loss Contingency, Loss in Period	$ 0

Commitments and Contingencies37

Commitments and Contingencies (Letter of Credit) (Narrative) (Details) - Letter of Credit [Member] - Bank of America Syndicate [Member] $ in Millions	Jun. 30, 2017USD ($)
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ 19.3
Performance Guarantee [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ 15.2

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($)	Jan. 02, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Jan. 01, 2017
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	581,139
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		13,963,435		13,963,435
Remaining Aggregate Number of Shares Available For Issuance		6,220,389		6,220,389
Income Tax Expense (Benefit)		$ 9,126,000	$ 9,250,000	$ 18,226,000	$ 17,810,000
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net					(1,200,000)
Stock Compensation Expense		1,300,000	$ 200,000	2,300,000	1,300,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount				$ 0	$ 0
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	$ 0.84
Granted, Weighted Average Fair Value				$ 5.63	$ 3.99
Share-based Payment Award, Options, Vested, Fair Value				$ 800,000	$ 1,400,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized		$ 2,400,000		$ 2,400,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition				2 years
Accounting Standards Update 2016-09 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income Tax Expense (Benefit)				$ (100,000)
New Accounting Pronouncement, Cumulative Effect of Change on Equity							$ 200,000
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
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				24,000		18,000
Restricted Stock [Member] | Director [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	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				55,380		132,988
Restricted Stock Units (RSUs) [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						26,788
Restricted Stock Units (RSUs) [Member] | Officer [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Restricted Stock Units (RSUs) [Member] | Officer [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						5 years

Stock-Based Compensation (Sched

Stock-Based Compensation (Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions) (Details)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation [Abstract]
Volatility	25.12%	23.66%
Expected life of options	3 years	3 years
Risk-free interest rate	1.67%	1.20%
Dividend yield	2.75%	3.00%

Stock-Based Compensation (Sch40

Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock options, Number of Shares, Period Start	1,160,419	2,495,310	2,495,310
Granted, Number of Shares	265,865		199,938
Exercised, Number of Shares	(102,936)	(525,212)	(1,045,789)
Cancelled and expired, Number of Shares	(32,871)		(489,040)
Stock options, Number of Shares, Period End	1,290,477		1,160,419
Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock options, Weighted Average Exercise Price, Period Start	$ 29.93	$ 30.86	$ 30.86
Granted, Weighted Average Exercise Price	36.87		34.22
Exercised, Weighted Average Exercise Price	31.15		29.24
Cancelled and expired, Weighted Average Exercise Price	32.88		37.91
Stock options, Weighted Average Exercise Price, Period End	$ 31.19		$ 29.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options outstanding, Aggregate Intrinsic Value	$ 13,156		$ 14,299	$ 3,583
Exercised, Aggregate Intrinsic Value	$ 690		$ 8,858
Stock options outstanding, Weighted Average Remaining Contractual Life	3 years
Stock options exercisable, Number of Shares	656,654
Stock options exercisable, Weighted Average Exercise Price	$ 28.53
Stock options exercisable, Aggregate Intrinsic Value	$ 8,441
Stock options exercisable, Weighted Average Remaining Contractual Life	2 years

Stock-Based Compensation (Sch41

Stock-Based Compensation (Schedule of Non-vested Share Activity) (Details) - $ / shares	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-vested [Roll Forward]
Non-vested stock options, Number of Shares, Period Start	562,927
Granted, Number of Shares	265,865		199,938
Vested, Number of Shares	(175,348)
Cancelled, Number of Shares	(19,621)
Non-vested stock options, Number of Shares, Period End	633,823		562,927
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	$ 4.66
Granted, Weighted Average Fair Value	5.63	$ 3.99
Vested, Weighted Average Fair Value	4.79
Cancelled, Weighted Average Fair Value	4.81
Non-vested stock options, Weighted Average Fair Value, Period End	$ 5.03		$ 4.66

Stock-Based Compensation (Sch42

Stock-Based Compensation (Schedule Of Share-based Compensation, Restricted Stock Activity) (Details) - Restricted Stock [Member] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Non-vested [Roll Forward]
Non-vested, Period Start	18,000	21,000
Granted	24,000	18,000
Vested	(18,000)	(21,000)
Non-vested, Period End	24,000	18,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Non-vested, Weighted Average Fair Value, Period Start	$ 33.84	$ 28.98
Granted, Weighted Average Fair Value	37.90	33.84
Vested, Weighted Average Fair Value	33.84	28.98
Non-vested, Weighted Average Fair Value, Period End	$ 37.90	$ 33.84

Stock-Based Compensation (Sch43

Stock-Based Compensation (Schedule of Share-based Compensation, Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Nonvested, Number of Shares [Roll Forward]
Non-vested, Period Start	206,338	93,450
Granted	55,380	132,988
Cancelled and expired	(87,125)	(20,100)
Non-vested, Period End	174,593	206,338
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Non-vested, Weighted Average Fair Value, Period Start	$ 30.10	$ 30.84
Granted, Weighted Average Fair Value	35.31	29.50
Cancelled and expired, Weighted Average Fair Value	30.80	29.56
Non-vested, Weighted Average Fair Value, Period End	$ 31.41	$ 30.10

Business Segment and Geograph44

Business Segment and Geographic Area Information (Narrative) (Details) - reportable_segment	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Number of Reportable Segments			1
Revenues [Member] | Government Contracts Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage			98.00%	98.00%
Revenues [Member] | UNITED STATES [Member]
Segment Reporting Information [Line Items]
Percentage	98.00%	98.00%	98.00%	99.00%
Revenues [Member] | International [Member]
Segment Reporting Information [Line Items]
Percentage	2.00%	2.00%	2.00%	1.00%