Mantech International (MANT) 10-Q 31 Jul 20 2020 Q2 Quarterly report Financial data

Cover Page Cover Page

Cover Page Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 29, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	000-49604
Entity Registrant Name	ManTech International Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-1852179
Entity Address, Address Line One	2251 Corporate Park Drive
Entity Address, City or Town	Herndon
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20171
City Area Code	703
Local Phone Number	218-6000
Title of 12(b) Security	Class A Common Stock
Trading Symbol	MANT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Small Reporting Company	false
Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000892537
Current Fiscal Year End Date	--12-31
Class A common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		27,145,551
Class B common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		13,187,195

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 29,668	$ 8,854
Receivables—net	443,018	398,976
Prepaid expenses	38,172	20,030
Taxes receivable—current	6,586	21,996
Other current assets	6,089	4,878
Total Current Assets	523,533	454,734
Goodwill	1,191,270	1,191,259
Other intangible assets—net	188,651	196,778
Property and equipment—net	111,381	85,631
Operating lease right of use assets	102,187	117,728
Employee supplemental savings plan assets	32,740	36,777
Investments	11,549	11,550
Other assets	13,458	13,457
TOTAL ASSETS	2,174,769	2,107,914
LIABILITIES
Accounts payable and accrued expenses	146,936	146,016
Accrued salaries and related expenses	114,911	97,298
Contract liabilities	47,766	27,620
Operating lease obligations—current	29,063	29,047
Total Current Liabilities	338,676	299,981
Deferred income taxes	134,352	131,782
Operating lease obligations—long term	89,149	103,148
Accrued retirement	31,525	35,552
Long term debt	20,000	36,500
Other long-term liabilities	27,978	10,309
TOTAL LIABILITIES	641,680	617,272
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Additional paid-in capital	535,464	525,851
Treasury stock	(9,158)	(9,158)
Retained earnings	1,006,624	973,767
Accumulated other comprehensive loss	(247)	(222)
TOTAL STOCKHOLDERS' EQUITY	1,533,089	1,490,642
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,174,769	2,107,914
Class A common stock
STOCKHOLDERS' EQUITY
Common stock	274	272
TOTAL STOCKHOLDERS' EQUITY	274	272
Class B common stock
STOCKHOLDERS' EQUITY
Common stock	132	132
TOTAL STOCKHOLDERS' EQUITY	$ 132	$ 132

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets Parentheticals - $ / shares	Jun. 30, 2020	Dec. 31, 2019
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	27,388,381	27,235,860
Common stock, Shares outstanding	27,144,268	26,991,747
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	13,187,195	13,187,195
Common stock, Shares outstanding	13,187,195	13,187,195

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUE	$ 632,492,000	$ 537,037,000	$ 1,243,404,000	$ 1,038,967,000
Cost of services	539,473,000	459,266,000	1,059,764,000	890,349,000
General and administrative expenses	53,433,000	44,474,000	105,156,000	86,789,000
OPERATING INCOME	39,586,000	33,297,000	78,484,000	61,829,000
Interest expense	(632,000)	(945,000)	(1,287,000)	(1,429,000)
Interest income	137,000	121,000	187,000	311,000
Other income (expense), net	0	31,000	(22,000)	(11,000)
INCOME FROM OPERATIONS BEFORE INCOME TAXES AND EQUITY METHOD INVESTMENTS	39,091,000	32,504,000	77,362,000	60,700,000
Provision for income taxes	(9,143,000)	(8,290,000)	(18,734,000)	(15,356,000)
Equity in (losses) of unconsolidated subsidiaries	0	0	(1,000)	(12,000)
NET INCOME	$ 29,948,000	$ 24,214,000	$ 58,627,000	$ 45,332,000
Class A common stock
BASIC EARNINGS PER SHARE:
Basic earnings per share	$ 0.74	$ 0.61	$ 1.46	$ 1.14
DILUTED EARNINGS PER SHARE:
Diluted earnings per share	0.74	0.60	1.44	1.13
Class B common stock
BASIC EARNINGS PER SHARE:
Basic earnings per share	0.74	0.61	1.46	1.14
DILUTED EARNINGS PER SHARE:
Diluted earnings per share	$ 0.74	$ 0.60	$ 1.44	$ 1.13

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
NET INCOME	$ 29,948,000	$ 24,214,000	$ 58,627,000	$ 45,332,000
OTHER COMPREHENSIVE INCOME (LOSS):
Translation adjustments, net of tax	(8,000)	(7,000)	(25,000)	5,000
Cumulative-effect adjustment for adoption of Accounting Standards Update 2018-02	0	0	0	(24,000)
Total other comprehensive (loss)	(8,000)	(7,000)	(25,000)	(19,000)
COMPREHENSIVE INCOME	$ 29,940,000	$ 24,207,000	$ 58,602,000	$ 45,313,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Stockholders' Equity Statement - USD ($)	Total	Common Stock, Class A	Common Stock, Class B	Additional Paid-In Capital	Treasury Stock, at cost	Retained Earnings	Accumulated Other Comprehensive Loss
At beginning of period at Dec. 31, 2018		$ 268,000	$ 132,000	$ 506,970,000	$ (9,158,000)	$ 903,084,000	$ (102,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 3,250,000	1,000		3,249,000
Stock option exercises		1,000		4,978,000
Payment consideration to tax authority on employees' behalf				(1,357,000)
Net income	45,332,000					45,332,000
Dividends						(21,537,000)
Translation adjustments, net of tax	5,000						5,000
Cumulative-effect adjustment for adoption of Accounting Standards Update 2018-02	(24,000)						(24,000)
At end of period at Jun. 30, 2019	1,431,842,000	270,000	132,000	513,840,000	(9,158,000)	926,879,000	(121,000)
At beginning of period at Mar. 31, 2019		269,000	132,000	508,605,000	(9,158,000)	913,453,000	(114,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		1,000		1,938,000
Stock option exercises		0		3,297,000
Payment consideration to tax authority on employees' behalf				0
Net income	24,214,000					24,214,000
Dividends						(10,788,000)
Translation adjustments, net of tax	(7,000)						(7,000)
Cumulative-effect adjustment for adoption of Accounting Standards Update 2018-02	0						0
At end of period at Jun. 30, 2019	1,431,842,000	270,000	132,000	513,840,000	(9,158,000)	926,879,000	(121,000)
At beginning of period at Dec. 31, 2019	1,490,642,000	272,000	132,000	525,851,000	(9,158,000)	973,767,000	(222,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	5,510,000	1,000		5,509,000
Stock option exercises		1,000		4,881,000
Payment consideration to tax authority on employees' behalf				(777,000)
Net income	58,627,000					58,627,000
Dividends						(25,770,000)
Translation adjustments, net of tax	(25,000)						(25,000)
Cumulative-effect adjustment for adoption of Accounting Standards Update 2018-02	0						0
At end of period at Jun. 30, 2020	1,533,089,000	274,000	132,000	535,464,000	(9,158,000)	1,006,624,000	(247,000)
At beginning of period at Mar. 31, 2020		273,000	132,000	529,763,000	(9,158,000)	989,578,000	(239,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		1,000		2,874,000
Stock option exercises		0		2,827,000
Payment consideration to tax authority on employees' behalf				0
Net income	29,948,000					29,948,000
Dividends						(12,902,000)
Translation adjustments, net of tax	(8,000)						(8,000)
Cumulative-effect adjustment for adoption of Accounting Standards Update 2018-02	0						0
At end of period at Jun. 30, 2020	$ 1,533,089,000	$ 274,000	$ 132,000	$ 535,464,000	$ (9,158,000)	$ 1,006,624,000	$ (247,000)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 58,627,000	$ 45,332,000
Adjustments to reconcile net income to net cash flow from (used in) operating activities:
Depreciation and amortization	33,154,000	25,630,000
Noncash lease expense	13,357,000	13,503,000
Deferred income taxes	2,570,000	5,468,000
Stock-based compensation expense	5,510,000	3,250,000
Bad debt expense	2,156,000	0
Contract loss reserve	(372,000)	(505,000)
Equity in losses of unconsolidated subsidiaries	1,000	12,000
Change in assets and liabilities—net of effects from acquired businesses:
Receivables—net	(46,198,000)	30,151,000
Prepaid expenses	(18,142,000)	(13,704,000)
Taxes receivable—current	15,410,000	(1,711,000)
Other current assets	1,026,000	2,896,000
Employee supplemental savings plan asset	(100,000)	(4,253,000)
Accounts payable and accrued expenses	2,196,000	11,522,000
Accrued salaries and related expenses	17,613,000	1,353,000
Operating lease obligations	(14,286,000)	(13,487,000)
Contract liabilities	20,146,000	15,317,000
Accrued retirement	(4,027,000)	1,977,000
Other long-term liabilities	17,687,000	280,000
Other	(1,651,000)	412,000
Net cash flow from operating activities	104,677,000	123,443,000
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Purchases of property and equipment	(45,600,000)	(21,946,000)
Investment in capitalized software	(5,016,000)	(1,952,000)
Proceeds from corporate owned life insurance	4,137,000	0
Proceeds from sale of property and equipment	869,000	0
Acquisition of a business-net of cash acquired	0	(114,552,000)
Deferred contract costs	0	(2,658,000)
Proceeds from equity method investment	0	283,000
Net cash used in investing activities	(45,610,000)	(140,825,000)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Borrowing under revolving credit facility	261,500,000	333,000,000
Repayments under revolving credit facility	(278,000,000)	(297,000,000)
Dividends paid	(25,782,000)	(21,548,000)
Proceeds from exercise of stock options	4,882,000	4,979,000
Payment consideration to tax authority on employees' behalf	(777,000)	(1,357,000)
Principal paid on financing leases	(76,000)	(62,000)
Net cash from (used in) financing activities	(38,253,000)	18,012,000
NET CHANGE IN CASH AND CASH EQUIVALENTS	20,814,000	630,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	8,854,000	5,294,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	29,668,000	5,924,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	1,256,000	1,248,000
Cash paid for income taxes, net of refunds	(1,493,000)	10,323,000
Noncash investing and financing activities:
Operating lease obligations arising from obtaining right of use assets	303,000	12,142,000
Finance lease obligations arising from obtaining right of use assets	63,000	352,000
Noncash investing activities	$ 2,528,000	$ 376,000

Description of the Business (No

Description of the Business (Notes)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business [Text Block]	Description of the Business

Basis of Presentation (Notes)

Basis of Presentation (Notes)	6 Months Ended
	Jun. 30, 2020
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, revenue 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, 2019 , 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.

Revenue from Contracts with Cus

Revenue from Contracts with Customers (Notes)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customer [Text Block]	Revenue from Contracts with Customers We derive revenue from contracts with customers primarily from contracts with the U.S. government in the areas of defense, intelligence, homeland security and other federal civilian agencies. Substantially all of our revenue is derived from services and solutions provided to the U.S. government or to prime contractors supporting the U.S. government, including services by our employees and our subcontractors, and solutions that include third-party hardware and software that we purchase and integrate as a part of our overall solutions. Customer requirements may vary from period-to-period depending on specific contract and customer requirements. We provide our services and solutions under three types of contracts: cost-reimbursable, fixed-price and time-and-materials. Under cost-reimbursable contracts, we are reimbursed for costs that are determined to be reasonable, allowable and allocable to the contract and paid a fee representing the profit margin negotiated between us and the contracting agency, which may be fixed or performance based. Under fixed-price contracts, we perform specific tasks for a fixed price. Fixed-price contracts may include either a product delivery or specific service performance over a defined period. Under time-and-materials contracts, we are reimbursed for labor at fixed hourly rates and are generally reimbursed separately for allowable materials and expenses at cost. For contracts that do not meet the criteria to measure performance as a right to invoice under the series guidance, we utilize an Estimate at Completion process to measure progress toward completion. We typically estimate progress towards completion based on cost incurred or direct labor incurred. As part of this process, we review information including, but not limited to, any outstanding key contract matters, progress towards completion and the related program schedule, identified risks and opportunities and the related changes in estimates of revenue and costs. The risks and opportunities include judgments about the ability and cost to achieve the contract milestones and other technical contract requirements. We make assumptions and estimates regarding labor productivity and availability, the complexity of the work to be performed, the availability of materials, the length of time to complete the performance obligation, execution by our subcontractors, the availability and timing of funding from our customer and overhead cost rates, among other variables. A significant change in one or more of these estimates could affect the timing in which we recognize revenue on our contracts. For the three months ended June 30, 2020 and 2019 , the aggregate impact of adjustments in contract estimates increased our revenue by $5.8 million and $3.5 million , respectively. For the six months ended June 30, 2020 and 2019 , the aggregate impact of adjustments in contract estimates increased our revenue by $7.2 million and $5.6 million , respectively. We have one reportable segment. Our U.S. government customers typically exercise independent decision-making and contracting authority. Offices or divisions within an agency or department of the U.S. government may directly, or through a prime contractor, use our services as a separate customer as long as the customer has independent decision-making and contracting authority within its organization. We treat sales to U.S. government customers as sales within the U.S. regardless of where the services are performed. We generated 99% of our revenue from sales in the U.S. for both the three months ended June 30, 2020 and 2019 . We generated 99% of our revenue from sales in the U.S. for both the six months ended June 30, 2020 and 2019 . The following tables disclose revenue (in thousands) by contract type, customer and contractor type for the periods presented. Three months ended Six months ended 2020 2019 2020 2019 Cost-reimbursable $ 432,876 $ 371,852 $ 851,531 $ 731,617 Fixed-price 120,359 108,028 241,914 203,091 Time-and-materials 79,257 57,157 149,959 104,259 Revenue $ 632,492 $ 537,037 $ 1,243,404 $ 1,038,967 Three months ended Six months ended 2020 2019 2020 2019 U.S. Government $ 622,627 $ 524,976 $ 1,223,155 $ 1,015,993 State agencies, international agencies and commercial entities 9,865 12,061 20,249 22,974 Revenue $ 632,492 $ 537,037 $ 1,243,404 $ 1,038,967 Three months ended Six months ended 2020 2019 2020 2019 Prime contractor $ 577,377 $ 477,986 $ 1,132,545 $ 924,505 Subcontractor 55,115 59,051 110,859 114,462 Revenue $ 632,492 $ 537,037 $ 1,243,404 $ 1,038,967 The components of our receivables are as follows (in thousands): June 30, 2020 December 31, 2019 Billed receivables $ 357,092 $ 311,061 Unbilled receivables 100,290 99,493 Allowance for doubtful accounts (14,364 ) (11,578 ) Receivables—net $ 443,018 $ 398,976 Receivables at June 30, 2020 are expected to be substantially collected within one year except for approximately $2.6 million , a majority is related to U.S. government receivables. We do not believe that we have significant exposure to credit risk as billed receivables and unbilled receivables are primarily due from the U.S. government. The allowance for doubtful accounts represents our estimate for exposure due to compliance, contractual issues and bad debts related to prime contractors. The following table discloses contract liabilities (in thousands): June 30, 2020 December 31, 2019 Contract liabilities $ 47,766 $ 27,620 Changes in the balance of contract liabilities are primarily due to the timing difference between our performance and our customers' payments. For the three months ended June 30, 2020 , the amount of revenue that was included in the opening contract liabilities balance were $1.8 million . For the six months ended June 30, 2020, the amount of revenue that was included in the opening contract liabilities balance was $18.5 million . The remaining performance obligation as of June 30, 2020 is $2.2 billion . The following table discloses when we expect to recognize the remaining performance obligation as revenue (in billions): For the remaining six months ending December 31, 2020 For the year ending December 31, 2021 December 31, 2022 Thereafter $ 1.0 $ 0.7 $ 0.2 $ 0.3

Acquisitions (Notes)

Acquisitions (Notes)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions H2M Group (H2M) —On August 8, 2019 , we completed the acquisition of H2M through a membership interest purchase agreement by and among H2M Group, HHM Holding LLC, and the Members and ManTech International Corporation. H2M is a provider of intelligence and analysis services and solutions primarily to the National Geospatial-Intelligence Agency (NGA). This acquisition strengthens our ability to help key government agencies implement new automation techniques that enable intelligence analysts to more efficiently navigate large amounts of data and distill critical information to inform actionable intelligence and make mission-critical decisions. The acquisition was accounted for as a business combination. The results of H2M's operations have been included in our condensed consolidated financial statements since that date. We funded the acquisition with cash on hand and borrowings on our revolving credit facility. The purchase price of $38.5 million , which includes the finalized working capital adjustment, was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation for H2M is complete as of June 30, 2020 . Determining the fair value of assets acquired and liabilities assumed requires significant judgment, which includes, among other factors, analysis of historical performance and estimates of future performance of H2M's contracts. In some cases, we have used discounted cash flow analyses, which were based on our best estimate of future revenue, earnings and cash flows as well as our discount rate adjusted for risk. Recognition of goodwill is largely attributed to the value paid for H2M's capabilities to support government agencies in the implementation of high-quality geospatial and professional services. The goodwill recorded for this transaction will be deductible for tax purposes over 15 years . The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $9.6 million and $2.3 million , respectively. The fair values of the customer relationships and backlog were determined using the excess earnings method (income approach) in which the value is derived from an estimation of the after-tax cash flows specifically attributable to backlog and customer relationships. Assumptions used in the analysis included revenue and expense forecasts, contributory asset charges, tax amortization benefit and discount rates. Customer contracts and related relationships represent the underlying relationships and agreements with H2M'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 using the pattern of benefits method over its estimated useful life of 2 years . The weighted-average amortization period for other intangible assets is 17 years . The following table represents the purchase price allocation for H2M (in thousands): Cash and cash equivalents $ 29 Receivables 4,187 Prepaid expenses 188 Other current assets 5 Goodwill 25,089 Other intangible assets 11,900 Operating lease right of use assets 152 Property and equipment 56 Other assets 7 Accounts payable and accrued expenses (1,956 ) Accrued salaries and related expenses (1,023 ) Operating lease obligations—long term (152 ) Net assets acquired and liabilities assumed $ 38,482 Kforce Government Solutions (KGS) —On April 1, 2019 , we completed the acquisition of KGS. KGS was a wholly owned subsidiary of the publicly traded commercial technology and staffing company KForce, Inc. The acquisition was completed through an equity purchase agreement dated February 28, 2019 , by and among Kforce Government Solutions, Inc and other beneficiaries and ManTech International Corporation. KGS provides services, IT solutions, transformation and management consulting and data analytics - most notably in the healthcare IT market. This acquisition expands our presence with important customers such as the Department of Veteran Affairs (VA). The acquisition was accounted for as a business combination. The results of KGS's operations have been included in our consolidated financial statements since that date. We funded the acquisition with cash on hand and borrowings on our revolving credit facility. The purchase price of $ 114.6 million , which includes the finalized working capital adjustment, was allocated to the underlying assets and liabilities based on their estimated fair value at the date of acquisition. The excess of the purchase price over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation of KGS is complete as of June 30, 2020 . Determining the fair value of assets acquired and liabilities assumed requires significant judgment, which includes, among other factors, analysis of historical performance and estimates of future performance of KGS’s contracts. In some cases, we have used discounted cash flow analyses, which were based on our best estimate of future revenue, earnings and cash flows as well as our discount rate adjusted for risk. Recognition of goodwill is largely attributed to the value paid for KGS's capabilities to support customers in IT solutions, transformation and management consulting and data analytics. A majority of the goodwill recorded will not be deductible for tax purposes. The components of other intangible assets associated with the acquisition were customer relationships and backlog valued at $ 33.1 million and $ 1.6 million , respectively. The fair values of the customer relationships and backlog were determined using the excess earnings method (income approach) in which the value is derived from an estimation of the after-tax cash flows specifically attributable to backlog and customer relationships. Assumptions used in the analysis included revenue and expense forecasts, contributory asset charges, tax amortization benefit and discount rates. Customer contracts and related relationships represent the underlying relationships and agreements with KGS'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 other intangible assets is 19 years . The following table represents the finalized purchase price allocation for KGS (in thousands): Cash and cash equivalents $ 154 Receivables 17,071 Prepaid expenses 368 Other current assets 168 Goodwill 80,374 Other intangible assets 34,839 Property and equipment 361 Accounts payable and accrued expenses (6,895 ) Accrued salaries and related expenses (4,421 ) Deferred income taxes (7,087 ) Other long-term liabilities (379 ) Net assets acquired and liabilities assumed $ 114,553

Earnings Per Share (Notes)

Earnings Per Share (Notes)	6 Months Ended
	Jun. 30, 2020
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 the six months ended June 30, 2020 and 2019 , we declared and paid a quarterly dividend in the amount of $0.32 per share and $0.27 per share, respectively, 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 2020 2019 2020 2019 Distributed earnings $ 12,902 $ 10,788 $ 25,770 $ 21,537 Undistributed earnings 17,046 13,426 32,857 23,795 Net income $ 29,948 $ 24,214 $ 58,627 $ 45,332 Class A common stock: Basic net income available to common stockholders $ 20,141 $ 16,210 $ 39,407 $ 30,324 Basic weighted average common shares outstanding 27,082 26,707 27,037 26,646 Basic earnings per share $ 0.74 $ 0.61 $ 1.46 $ 1.14 Diluted net income available to common stockholders $ 20,220 $ 16,255 $ 39,576 $ 30,411 Effect of potential exercise of stock options 327 229 358 232 Diluted weighted average common shares outstanding 27,409 26,936 27,395 26,878 Diluted earnings per share $ 0.74 $ 0.60 $ 1.44 $ 1.13 Class B common stock: Basic net income available to common stockholders $ 9,807 $ 8,004 $ 19,220 $ 15,008 Basic weighted average common shares outstanding 13,187 13,188 13,187 13,188 Basic earnings per share $ 0.74 $ 0.61 $ 1.46 $ 1.14 Diluted net income available to common stockholders $ 9,728 $ 7,959 $ 19,051 $ 14,921 Diluted weighted average common shares outstanding 13,187 13,188 13,187 13,188 Diluted earnings per share $ 0.74 $ 0.60 $ 1.44 $ 1.13 For the three months ended June 30, 2020 and 2019 , options to purchase 228,816 shares and 479,685 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, 2020 and 2019 , options to purchase 231,938 shares and 496,859 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, 2020 and 2019 , there were 103,660 shares and 144,585 shares, respectively, issued from the exercise of stock options. For the six months ended June 30, 2020 and 2019 there were 48,861 shares and 72,493 shares, respectively, issued from the vesting of restricted stock units.

Property and Equipment (Notes)

Property and Equipment (Notes)	6 Months Ended
	Jun. 30, 2020
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 $ 184,038 $ 150,640 Leasehold improvements 50,817 49,625 Finance leases 704 641 Property and equipment—gross 235,559 200,906 Accumulated depreciation and amortization (124,178 ) (115,275 ) Property and equipment—net $ 111,381 $ 85,631 Depreciation and amortization expense related to property and equipment for the three months ended June 30, 2020 and 2019 was $9.7 million and $6.2 million , respectively. Depreciation and amortization related to property and equipment for the six months ended June 30, 2020 and 2019 was $18.5 million and $12.5 million , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets (Notes)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets [Text Block]	Goodwill and Other Intangible Assets The change in the carrying amount of goodwill during the year ended December 31, 2019 and six months ended June 30, 2020 are as follows (in thousands): Goodwill Balance Goodwill at December 31, 2018 $ 1,085,806 Acquisitions 105,453 Goodwill at December 31, 2019 1,191,259 Acquisition fair value adjustment 11 Goodwill at June 30, 2020 $ 1,191,270 Other intangible assets consisted of the following (in thousands): June 30, 2020 December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Other intangible assets: Contract and program intangible assets $ 402,532 $ 231,971 $ 170,561 $ 402,532 $ 221,437 $ 181,095 Capitalized software 56,075 37,985 18,090 52,411 36,728 15,683 Total other intangible assets—net $ 458,607 $ 269,956 $ 188,651 $ 454,943 $ 258,165 $ 196,778 Amortization expense relating to intangible assets for the three months ended June 30, 2020 and 2019 was $6.5 million and $6.1 million , respectively. Amortization expense relating to intangible assets for the six months ended June 30, 2020 and 2019 was $13.0 million and $11.9 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, 2020 $ 12,865 For the year ending: December 31, 2021 $ 23,932 December 31, 2022 $ 21,306 December 31, 2023 $ 18,021 December 31, 2024 $ 16,276 December 31, 2025 $ 13,789

Debt (Notes)

Debt (Notes)	6 Months Ended
	Jun. 30, 2020
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 $75 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 August 17, 2022 . Borrowings under our credit agreement are collateralized by substantially all of our assets and those of 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 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 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, 2020 and 2019 , we were in compliance with the financial covenants under the credit agreement. There was $20.0 million and $36.5 million outstanding on our revolving credit facility at June 30, 2020 and December 31, 2019 , respectively. The maximum available borrowing under the revolving credit facility at June 30, 2020 was $473.7 million . As of June 30, 2020 , we were contingently liable under letters of credit totaling $6.3 million

Commitments and Contingencies (

Commitments and Contingencies (Notes)	6 Months Ended
	Jun. 30, 2020
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 2016 with no material adjustments. The remaining audits for 2017 through 2019 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. We have $6.3 million outstanding on our letter of credit, of which $5.7 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, 2020
Share-based Payment Arrangement, Noncash Expense [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, among others, stock options, restricted stock and restricted stock units (RSUs), among others. 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, 2020 , there were 602,684 additional shares made available for issuance under the Plan. Through June 30, 2020 , the Board of Directors has authorized the issuance of up to 15,751,005 shares under this Plan. Through June 30, 2020 , the remaining aggregate number of shares of our common stock available for future grants under the Plan was 7,068,410 . 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. Stock Compensation Expense —For the three months ended June 30, 2020 and 2019 , we recorded $2.9 million and $1.9 million of stock-based compensation expense. For the six months ended June 30, 2020 and 2019 , we recorded $5.5 million and $3.2 million of stock-based compensation expense. No compensation expense of employees with stock awards, including stock-based compensation expense, was capitalized during the periods. For the three months ended June 30, 2020 and 2019 , we recorded $0.3 million and $0.5 million , respectively, to income tax benefit related to the exercise of stock options, vested cancellations and the vesting of restricted stock and restricted stock units. For the six months ended June 30, 2020 and 2019 , we recorded $0.8 million and $0.7 million , respectively, to income tax benefit related to the exercise of stock options, vested cancellations and the vesting of restricted stock and restricted stock units. Stock Options —Under the Plan, we have issued stock options. A stock option gives the holder the right, but not the obligation to purchase a certain number of shares at a predetermined price for a specific period. 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. There were no option grants during the six months ended June 30, 2020 . The following weighted-average assumptions were used for option grants during the six months ended June 30, 2019 : • 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. For the six months ended June 30, 2019 , we have calculated our expected dividend yield based on an expected annual cash dividend of $1.08 per share. The following table summarizes weighted-average assumptions used in our calculations of fair value for the six months ended June 30, 2019 : Six months ended Volatility 27.00 % Expected life of options 3 years Risk-free interest rate 2.39 % Dividend yield 2.00 % Stock Option Activity — No options were granted during the six months ended June 30, 2020 . The weighted-average fair value of options granted during the six months ended June 30, 2019 , as determined under the Black-Scholes-Merton valuation model, was $10.07 . Option grants that vested during the six months ended June 30, 2020 and 2019 had a combined fair value of $1.7 million and $1.2 million , respectively. The following table summarizes stock option activity for the year ended December 31, 2019 and the six months ended June 30, 2020 : Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Stock options outstanding at December 31, 2018 1,093,400 $ 45.34 $ 8,776 Granted 489,947 $ 63.87 Exercised (338,748 ) $ 37.94 $ 9,641 Cancelled and expired (108,504 ) $ 51.21 Stock options outstanding at December 31, 2019 1,136,095 $ 54.98 $ 28,291 Exercised (103,660 ) $ 47.10 $ 3,227 Cancelled and expired (98,446 ) $ 60.89 Stock options outstanding at June 30, 2020 933,989 $ 55.23 $ 13,662 3 years Stock options exercisable at June 30, 2020 382,652 $ 46.37 $ 8,467 2 years The following table summarizes non-vested stock options for the six months ended June 30, 2020 : Number of Shares Weighted Average Fair Value Non-vested stock options at December 31, 2019 845,555 $ 10.88 Vested (197,689 ) $ 8.76 Cancelled (96,529 ) $ 11.56 Non-vested stock options at June 30, 2020 551,337 $ 11.52 Unrecognized compensation expense related to non-vested awards was $4.7 million as of June 30, 2020 , 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 vest on the one year anniversary of the grant date. 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, 2019 and the six months ended June 30, 2020 . Number of Shares Weighted Average Fair Value Non-vested restricted stock at December 31, 2018 20,000 $ 52.83 Granted 24,000 $ 62.66 Vested (20,000 ) $ 52.83 Non-vested restricted stock at December 31, 2019 24,000 $ 62.66 Granted 24,000 $ 71.11 Vested (24,000 ) $ 62.66 Non-vested restricted stock at June 30, 2020 24,000 $ 71.11 RSUs —Under the Plan, we have issued restricted stock units (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. Our employees' performance-based 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. Our employees' time-based RSUs will result in the delivery of shares in one-third increments on the first, second and third anniversaries of 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 —For performance-based RSUs that vested in the six months ended June 30, 2020 , each RSU awarded resulted in the issuance of one share, which were issued net of applicable payroll tax withholdings. For the year ended December 31, 2019 , each RSU awarded resulted in the issuance of 1.5 shares, which were issued net of applicable payroll tax withholdings. The following table summarizes the non-vested RSU activity during the year ended December 31, 2019 and the six months ended June 30, 2020 : Number of Units Weighted Average Fair Value Non-vested RSUs at December 31, 2018 137,596 $ 45.11 Granted 145,440 $ 59.43 Vested (60,915 ) $ 42.75 Forfeited (11,294 ) $ 51.88 Non-vested RSUs at December 31, 2019 210,827 $ 55.31 Granted 187,450 $ 68.29 Vested (35,882 ) $ 51.80 Forfeited (43,970 ) $ 63.59 Non-vested RSUs at June 30, 2020 318,425 $ 62.21

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue by Contract Type [Table Text Block]	Three months ended Six months ended 2020 2019 2020 2019 Cost-reimbursable $ 432,876 $ 371,852 $ 851,531 $ 731,617 Fixed-price 120,359 108,028 241,914 203,091 Time-and-materials 79,257 57,157 149,959 104,259 Revenue $ 632,492 $ 537,037 $ 1,243,404 $ 1,038,967
Revenue by Customer [Table Text Block]	Three months ended Six months ended 2020 2019 2020 2019 U.S. Government $ 622,627 $ 524,976 $ 1,223,155 $ 1,015,993 State agencies, international agencies and commercial entities 9,865 12,061 20,249 22,974 Revenue $ 632,492 $ 537,037 $ 1,243,404 $ 1,038,967
Revenue by Contractor Type [Table Text Block]	Three months ended Six months ended 2020 2019 2020 2019 Prime contractor $ 577,377 $ 477,986 $ 1,132,545 $ 924,505 Subcontractor 55,115 59,051 110,859 114,462 Revenue $ 632,492 $ 537,037 $ 1,243,404 $ 1,038,967
Schedule Of Contract Receivables [Table Text Block]	The components of our receivables are as follows (in thousands): June 30, 2020 December 31, 2019 Billed receivables $ 357,092 $ 311,061 Unbilled receivables 100,290 99,493 Allowance for doubtful accounts (14,364 ) (11,578 ) Receivables—net $ 443,018 $ 398,976
Contract with Customer, Asset and Liability [Table Text Block]	The following table discloses contract liabilities (in thousands): June 30, 2020 December 31, 2019 Contract liabilities $ 47,766 $ 27,620
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	The following table discloses when we expect to recognize the remaining performance obligation as revenue (in billions): For the remaining six months ending December 31, 2020 For the year ending December 31, 2021 December 31, 2022 Thereafter $ 1.0 $ 0.7 $ 0.2 $ 0.3

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2020
H2M Group [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table represents the purchase price allocation for H2M (in thousands): Cash and cash equivalents $ 29 Receivables 4,187 Prepaid expenses 188 Other current assets 5 Goodwill 25,089 Other intangible assets 11,900 Operating lease right of use assets 152 Property and equipment 56 Other assets 7 Accounts payable and accrued expenses (1,956 ) Accrued salaries and related expenses (1,023 ) Operating lease obligations—long term (152 ) Net assets acquired and liabilities assumed $ 38,482
Kforce Government Solutions [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table represents the finalized purchase price allocation for KGS (in thousands): Cash and cash equivalents $ 154 Receivables 17,071 Prepaid expenses 368 Other current assets 168 Goodwill 80,374 Other intangible assets 34,839 Property and equipment 361 Accounts payable and accrued expenses (6,895 ) Accrued salaries and related expenses (4,421 ) Deferred income taxes (7,087 ) Other long-term liabilities (379 ) Net assets acquired and liabilities assumed $ 114,553

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
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 2020 2019 2020 2019 Distributed earnings $ 12,902 $ 10,788 $ 25,770 $ 21,537 Undistributed earnings 17,046 13,426 32,857 23,795 Net income $ 29,948 $ 24,214 $ 58,627 $ 45,332 Class A common stock: Basic net income available to common stockholders $ 20,141 $ 16,210 $ 39,407 $ 30,324 Basic weighted average common shares outstanding 27,082 26,707 27,037 26,646 Basic earnings per share $ 0.74 $ 0.61 $ 1.46 $ 1.14 Diluted net income available to common stockholders $ 20,220 $ 16,255 $ 39,576 $ 30,411 Effect of potential exercise of stock options 327 229 358 232 Diluted weighted average common shares outstanding 27,409 26,936 27,395 26,878 Diluted earnings per share $ 0.74 $ 0.60 $ 1.44 $ 1.13 Class B common stock: Basic net income available to common stockholders $ 9,807 $ 8,004 $ 19,220 $ 15,008 Basic weighted average common shares outstanding 13,187 13,188 13,187 13,188 Basic earnings per share $ 0.74 $ 0.61 $ 1.46 $ 1.14 Diluted net income available to common stockholders $ 9,728 $ 7,959 $ 19,051 $ 14,921 Diluted weighted average common shares outstanding 13,187 13,188 13,187 13,188 Diluted earnings per share $ 0.74 $ 0.60 $ 1.44 $ 1.13

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2020
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 $ 184,038 $ 150,640 Leasehold improvements 50,817 49,625 Finance leases 704 641 Property and equipment—gross 235,559 200,906 Accumulated depreciation and amortization (124,178 ) (115,275 ) Property and equipment—net $ 111,381 $ 85,631

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2020
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, 2019 and six months ended June 30, 2020 are as follows (in thousands): Goodwill Balance Goodwill at December 31, 2018 $ 1,085,806 Acquisitions 105,453 Goodwill at December 31, 2019 1,191,259 Acquisition fair value adjustment 11 Goodwill at June 30, 2020 $ 1,191,270
Schedule of Other Intangible Assets [Table Text Block]	Other intangible assets consisted of the following (in thousands): June 30, 2020 December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Other intangible assets: Contract and program intangible assets $ 402,532 $ 231,971 $ 170,561 $ 402,532 $ 221,437 $ 181,095 Capitalized software 56,075 37,985 18,090 52,411 36,728 15,683 Total other intangible assets—net $ 458,607 $ 269,956 $ 188,651 $ 454,943 $ 258,165 $ 196,778
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, 2020 $ 12,865 For the year ending: December 31, 2021 $ 23,932 December 31, 2022 $ 21,306 December 31, 2023 $ 18,021 December 31, 2024 $ 16,276 December 31, 2025 $ 13,789

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
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, 2019 : Six months ended Volatility 27.00 % Expected life of options 3 years Risk-free interest rate 2.39 % Dividend yield 2.00 %
Share-based Payment Arrangement, Option, Activity [Table Text Block]	The following table summarizes stock option activity for the year ended December 31, 2019 and the six months ended June 30, 2020 : Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Stock options outstanding at December 31, 2018 1,093,400 $ 45.34 $ 8,776 Granted 489,947 $ 63.87 Exercised (338,748 ) $ 37.94 $ 9,641 Cancelled and expired (108,504 ) $ 51.21 Stock options outstanding at December 31, 2019 1,136,095 $ 54.98 $ 28,291 Exercised (103,660 ) $ 47.10 $ 3,227 Cancelled and expired (98,446 ) $ 60.89 Stock options outstanding at June 30, 2020 933,989 $ 55.23 $ 13,662 3 years Stock options exercisable at June 30, 2020 382,652 $ 46.37 $ 8,467 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, 2020 : Number of Shares Weighted Average Fair Value Non-vested stock options at December 31, 2019 845,555 $ 10.88 Vested (197,689 ) $ 8.76 Cancelled (96,529 ) $ 11.56 Non-vested stock options at June 30, 2020 551,337 $ 11.52
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, 2019 and the six months ended June 30, 2020 . Number of Shares Weighted Average Fair Value Non-vested restricted stock at December 31, 2018 20,000 $ 52.83 Granted 24,000 $ 62.66 Vested (20,000 ) $ 52.83 Non-vested restricted stock at December 31, 2019 24,000 $ 62.66 Granted 24,000 $ 71.11 Vested (24,000 ) $ 62.66 Non-vested restricted stock at June 30, 2020 24,000 $ 71.11
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, 2019 and the six months ended June 30, 2020 : Number of Units Weighted Average Fair Value Non-vested RSUs at December 31, 2018 137,596 $ 45.11 Granted 145,440 $ 59.43 Vested (60,915 ) $ 42.75 Forfeited (11,294 ) $ 51.88 Non-vested RSUs at December 31, 2019 210,827 $ 55.31 Granted 187,450 $ 68.29 Vested (35,882 ) $ 51.80 Forfeited (43,970 ) $ 63.59 Non-vested RSUs at June 30, 2020 318,425 $ 62.21

Revenue from Contracts with C_3

Revenue from Contracts with Customers Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)Entities	Jun. 30, 2019USD ($)
Revenue from Contract with Customers [Line Items]
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	$ 5.8	$ 3.5	$ 7.2	$ 5.6
Number of Reportable Segments | Entities			1
Contract Receivable, Due after Next Rolling Twelve Months	2.6		$ 2.6
Contract with Customer, Liability, Revenue Recognized	1.8		18.5
Revenue, Remaining Performance Obligation, Amount	$ 2,200		$ 2,200
UNITED STATES | Revenue from Contract with Customer, Segment Benchmark [Member]
Revenue from Contract with Customers [Line Items]
Concentration Risk, Percentage	99.00%	99.00%	99.00%	99.00%

Revenue from Contracts with C_4

Revenue from Contracts with Customers Revenue by Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue by Contract Type [Line Items]
Revenue	$ 632,492	$ 537,037	$ 1,243,404	$ 1,038,967
Cost-reimbursable
Revenue by Contract Type [Line Items]
Revenue	432,876	371,852	851,531	731,617
Fixed-price
Revenue by Contract Type [Line Items]
Revenue	120,359	108,028	241,914	203,091
Time-and-materials
Revenue by Contract Type [Line Items]
Revenue	$ 79,257	$ 57,157	$ 149,959	$ 104,259

Revenue from Contracts with C_5

Revenue from Contracts with Customers Revenue by Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Revenue	$ 632,492	$ 537,037	$ 1,243,404	$ 1,038,967
U.S. Government
Revenue from External Customer [Line Items]
Revenue	622,627	524,976	1,223,155	1,015,993
State agencies, international agencies and commercial entities
Revenue from External Customer [Line Items]
Revenue	$ 9,865	$ 12,061	$ 20,249	$ 22,974

Revenue from Contracts with C_6

Revenue from Contracts with Customers Revenue by Contractor Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue by Contractor Type [Line Items]
Revenue	$ 632,492	$ 537,037	$ 1,243,404	$ 1,038,967
Prime contractor
Revenue by Contractor Type [Line Items]
Revenue	577,377	477,986	1,132,545	924,505
Subcontractor
Revenue by Contractor Type [Line Items]
Revenue	$ 55,115	$ 59,051	$ 110,859	$ 114,462

Revenue from Contracts with C_7

Revenue from Contracts with Customers Schedule of Contract Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Billed receivables	$ 357,092	$ 311,061
Unbilled receivables	100,290	99,493
Allowance for doubtful accounts	(14,364)	(11,578)
Receivables—net	$ 443,018	$ 398,976

Revenue from Contracts with C_8

Revenue from Contracts with Customers Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract liabilities	$ 47,766	$ 27,620

Revenue from Contracts with C_9

Revenue from Contracts with Customers Revenue, Remaining Performance Obligation (Details) $ in Billions	Jun. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Amount	$ 0.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Amount	$ 0.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Revenue, Remaining Performance Obligation, Amount	$ 0.3

Acquisitions Narrative (Details

Acquisitions Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
H2M Group [Member]
Business Combination, Consideration Transferred	$ 38.5
Expected Goodwill Tax Amortization Period	15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	17 years
Kforce Government Solutions [Member]
Business Combination, Consideration Transferred	$ 114.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	19 years
Customer Relationships [Member] | H2M Group [Member]
Finite-Lived Intangible Assets Acquired	$ 9.6
Finite-Lived Intangible Asset, Useful Life	20 years
Customer Relationships [Member] | Kforce Government Solutions [Member]
Finite-Lived Intangible Assets Acquired	$ 33.1
Finite-Lived Intangible Asset, Useful Life	20 years
Backlog [Member] | H2M Group [Member]
Finite-Lived Intangible Assets Acquired	$ 2.3
Finite-Lived Intangible Asset, Useful Life	2 years
Backlog [Member] | Kforce Government Solutions [Member]
Finite-Lived Intangible Assets Acquired	$ 1.6
Finite-Lived Intangible Asset, Useful Life	1 year

Acquisitions Schedule of Purcha

Acquisitions Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 1,191,270	$ 1,191,259	$ 1,085,806
H2M Group [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	29
Receivables	4,187
Prepaid expenses	188
Other current assets	5
Goodwill	25,089
Other intangible assets	11,900
Operating lease right of use assets	152
Property and equipment	56
Other assets	7
Accounts payable and accrued expenses	(1,956)
Accrued salaries and related expenses	(1,023)
Operating lease obligations—long term	(152)
Net assets acquired and liabilities assumed	38,482
Kforce Government Solutions [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	154
Receivables	17,071
Prepaid expenses	368
Other current assets	168
Goodwill	80,374
Other intangible assets	34,839
Property and equipment	361
Accounts payable and accrued expenses	(6,895)
Accrued salaries and related expenses	(4,421)
Deferred income taxes	(7,087)
Other long-term liabilities	(379)
Net assets acquired and liabilities assumed	$ 114,553

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - $ / shares	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Earnings Per Share [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.32	$ 0.32	$ 0.27	$ 0.27
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	228,816		479,685		231,938	496,859
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					103,660	144,585	338,748
Stock Issued During Period, Shares, Restricted Stock Vesting					48,861	72,493

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of Earnings Per Share, Basic and Diluted [Line Items]
Distributed earnings	$ 12,902	$ 10,788	$ 25,770	$ 21,537
Undistributed earnings	17,046	13,426	32,857	23,795
Net income	29,948	24,214	58,627	45,332
Class A common stock
Components of Earnings Per Share, Basic and Diluted [Line Items]
Basic net income available to common stockholders	$ 20,141	$ 16,210	$ 39,407	$ 30,324
Basic weighted average common shares outstanding	27,082	26,707	27,037	26,646
Basic earnings per share	$ 0.74	$ 0.61	$ 1.46	$ 1.14
Diluted net income available to common stockholders	$ 20,220	$ 16,255	$ 39,576	$ 30,411
Effect of potential exercise of stock options	327	229	358	232
Diluted weighted average common shares outstanding	27,409	26,936	27,395	26,878
Diluted earnings per share	$ 0.74	$ 0.60	$ 1.44	$ 1.13
Class B common stock
Components of Earnings Per Share, Basic and Diluted [Line Items]
Basic net income available to common stockholders	$ 9,807	$ 8,004	$ 19,220	$ 15,008
Basic weighted average common shares outstanding	13,187	13,188	13,187	13,188
Basic earnings per share	$ 0.74	$ 0.61	$ 1.46	$ 1.14
Diluted net income available to common stockholders	$ 9,728	$ 7,959	$ 19,051	$ 14,921
Diluted weighted average common shares outstanding	13,187	13,188	13,187	13,188
Diluted earnings per share	$ 0.74	$ 0.60	$ 1.44	$ 1.13

Property and Equipment (Propert

Property and Equipment (Property and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Furniture and equipment	$ 184,038	$ 150,640
Leasehold improvements	50,817	49,625
Finance leases	704	641
Property and equipment—gross	235,559	200,906
Accumulated depreciation and amortization	(124,178)	(115,275)
Property and equipment—net	$ 111,381	$ 85,631

Property and Equipment Narrativ

Property and Equipment Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense related to property and equipment	$ 9.7	$ 6.2	$ 18.5	$ 12.5

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 6.5	$ 6.1	$ 13	$ 11.9

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill	$ 1,191,259	$ 1,085,806
Acquisitions		105,453
Acquisition fair value adjustment	11
Goodwill	$ 1,191,270	$ 1,191,259

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 458,607	$ 454,943
Accumulated Amortization	269,956	258,165
Net Carrying Amount	188,651	196,778
Contract and program intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	402,532	402,532
Accumulated Amortization	231,971	221,437
Net Carrying Amount	170,561	181,095
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	56,075	52,411
Accumulated Amortization	37,985	36,728
Net Carrying Amount	$ 18,090	$ 15,683

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets, Future Amortization Expense) (Details) $ in Thousands	Jun. 30, 2020USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
For the remaining six months ending December 31, 2020	$ 12,865
For the year ending:
December 31, 2021	23,932
December 31, 2022	21,306
December 31, 2023	18,021
December 31, 2024	16,276
December 31, 2025	$ 13,789

Debt (Revolving Credit Facility

Debt (Revolving Credit Facility) (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Long-term Line of Credit	$ 20,000,000	$ 36,500,000
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
Long-term Line of Credit	20,000,000	$ 36,500,000
Line of Credit Facility, Remaining Borrowing Capacity	473,700,000
Bank of America Syndicate [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000
Contingent Liability under Letters of Credit	6,300,000
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 Contingencies_2

Commitments and Contingencies (Letter of Credit) (Narrative) (Details) - Letter of Credit [Member] - Bank of America Syndicate [Member] $ in Millions	Jun. 30, 2020USD ($)
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ 6.3
Performance Guarantee [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ 5.7

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($)	Jan. 02, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
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	602,684
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		15,751,005		15,751,005
Remaining Aggregate Number of Shares Available For Issuance		7,068,410		7,068,410
Share-based Compensation		$ 2,900,000	$ 1,900,000	$ 5,500,000	$ 3,200,000
Share-based Payment Arrangement, Amount Capitalized				0	0
Income tax expense (benefit) related to the exercise of stock options, vested cancellations and the vesting of restricted stock and restricted stock units		(300,000)	$ (500,000)	$ (800,000)	$ (700,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0		489,947
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					5 years
Expected Annual Cash Dividend					$ 1.08
Granted, Weighted Average Fair Value					$ 10.07
Share-based Payment Award, Options, Vested, Fair Value				$ 1,700,000	$ 1,200,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized		$ 4,700,000		$ 4,700,000
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Period for Recognition				2 years
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]
RSU Performance Factor, Number of Shares Issued				1		1.5

Stock-Based Compensation (Sched

Stock-Based Compensation (Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions) (Details)	6 Months Ended
	Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Volatility	27.00%
Expected life of options	3 years
Risk-free interest rate	2.39%
Dividend yield	2.00%

Stock-Based Compensation (Sch_2

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, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock options, Number of Shares, Period Start	1,136,095	1,093,400	1,093,400
Granted, Number of Shares	0		489,947
Exercised, Number of Shares	(103,660)	(144,585)	(338,748)
Cancelled and expired, Number of Shares	(98,446)		(108,504)
Stock options, Number of Shares, Period End	933,989		1,136,095
Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock options, Weighted Average Exercise Price, Period Start	$ 54.98	$ 45.34	$ 45.34
Granted, Weighted Average Exercise Price			63.87
Exercised, Weighted Average Exercise Price	47.10		37.94
Cancelled and expired, Weighted Average Exercise Price	60.89		51.21
Stock options, Weighted Average Exercise Price, Period End	$ 55.23		$ 54.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options outstanding, Aggregate Intrinsic Value	$ 13,662		$ 28,291	$ 8,776
Exercised, Aggregate Intrinsic Value	$ 3,227		$ 9,641
Stock options outstanding, Weighted Average Remaining Contractual Life	3 years
Stock options exercisable, Number of Shares	382,652
Stock options exercisable, Weighted Average Exercise Price	$ 46.37
Stock options exercisable, Aggregate Intrinsic Value	$ 8,467
Stock options exercisable, Weighted Average Remaining Contractual Life	2 years

Stock-Based Compensation (Sch_3

Stock-Based Compensation (Schedule of Non-vested Share Activity) (Details)	6 Months Ended
	Jun. 30, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-vested [Roll Forward]
Non-vested stock options, Number of Shares, Period Start | shares	845,555
Vested, Number of Shares | shares	(197,689)
Cancelled, Number of Shares | shares	(96,529)
Non-vested stock options, Number of Shares, Period End | shares	551,337
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 | $ / shares	$ 10.88
Vested, Weighted Average Fair Value | $ / shares	8.76
Cancelled, Weighted Average Fair Value | $ / shares	11.56
Non-vested stock options, Weighted Average Fair Value, Period End | $ / shares	$ 11.52

Stock-Based Compensation (Sch_4

Stock-Based Compensation (Schedule Of Share-based Compensation, Restricted Stock Activity) (Details) - Restricted Stock [Member] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Non-vested [Roll Forward]
Non-vested, Period Start	24,000	20,000
Granted	24,000	24,000
Vested	(24,000)	(20,000)
Non-vested, Period End	24,000	24,000
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	$ 62.66	$ 52.83
Granted, Weighted Average Fair Value	71.11	62.66
Vested, Weighted Average Fair Value	62.66	52.83
Non-vested, Weighted Average Fair Value, Period End	$ 71.11	$ 62.66

Stock-Based Compensation (Sch_5

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, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Nonvested, Number of Shares [Roll Forward]
Non-vested, Period Start	210,827	137,596
Granted	187,450	145,440
Vested	(35,882)	(60,915)
Forfeited	(43,970)	(11,294)
Non-vested, Period End	318,425	210,827
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	$ 55.31	$ 45.11
Granted, Weighted Average Fair Value	68.29	59.43
Vested, Weighted Average Fair Value	51.80	42.75
Forfeited, Weighted Average Fair Value	63.59	51.88
Non-vested, Weighted Average Fair Value, Period End	$ 62.21	$ 55.31