Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current [Abstract]      
Federal $ 13,641 $ 7,889 $ 12,654
State 2,352 1,486 2,544
Current Total 15,993 9,375 15,198
Deferred [Abstract]      
Federal 73 2,595 (848)
State 11 488 (26)
Deferred Total 84 3,083 (874)
Provision for income taxes $ 16,077 12,458 14,324
Federal statutory rate 35.00%    
Effective Income Tax Reconciliation [Abstract]      
Tax at statutory federal income tax rate $ 14,348 11,531 13,410
Increases (decreases) in tax resulting from [Abstract]      
State taxes, net of federal tax benefit 1,683 1,486 1,630
Permanent differences, net 88 (516) (685)
Other, net (42) (43) (31)
Provision for income taxes 16,077 12,458 $ 14,324
Gross deferred tax assets [Abstract]      
Deferred compensation and accrued paid leave 6,943 6,992  
Accrued expenses 2,228 1,276  
Stock-based compensation 765 592  
Interest rate swaps 47 0  
Reserves for contract disallowances 119 287  
Acquisition-related expenses 503 982  
Capitalized inventory 1,080 589  
Other 3 5  
Total gross deferred tax assets 11,688 10,723  
Gross deferred tax liabilities [Abstract]      
Depreciation (3,912) (2,830)  
Deferred revenues (2,189) (2,676)  
Goodwill and intangible assets (37,111) (5,017)  
Total gross deferred tax liabilities (43,212) (10,523)  
Net deferred tax assets   $ 200  
Net deferred tax liabilities $ (31,524)