Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Details)

v3.8.0.1
Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]      
Balance, beginning balance $ 198,622 $ 198,545  
Increase from acquisitions 0 77  
Balance, ending balance 198,622 198,622 $ 198,545
Amortization of intangible assets 16,017 16,067 15,576
Finite-Lived Intangible Assets [Line Items]      
Cost 202,164 202,164  
Accumulated Amortization (90,230) (74,213)  
Accumulated Impairment Loss (1,025) (1,025)  
Net Intangible Assets 110,909 126,926  
Finite-Lived Intangible Assets, Net [Abstract]      
2018 16,017    
2019 15,953    
2020 15,362    
2021 14,998    
2022 13,252    
Thereafter 35,327    
Total 110,909 126,926  
Supply Chain Management      
Goodwill [Roll Forward]      
Balance, beginning balance 63,190 63,113  
Increase from acquisitions 0 77  
Balance, ending balance 63,190 63,190 63,113
Federal Services Group      
Goodwill [Roll Forward]      
Balance, beginning balance 30,883 30,883  
Increase from acquisitions 0 0  
Balance, ending balance 30,883 30,883 30,883
Aviation      
Goodwill [Roll Forward]      
Balance, beginning balance 104,549 104,549  
Increase from acquisitions 0 0  
Balance, ending balance 104,549 104,549 $ 104,549
Contract and customer-related      
Finite-Lived Intangible Assets [Line Items]      
Cost 173,094 173,094  
Accumulated Amortization (72,937) (59,799)  
Accumulated Impairment Loss (1,025) (1,025)  
Net Intangible Assets 99,132 112,270  
Finite-Lived Intangible Assets, Net [Abstract]      
Total 99,132 112,270  
Acquired technologies      
Finite-Lived Intangible Assets [Line Items]      
Cost 12,400 12,400  
Accumulated Amortization (7,406) (6,278)  
Accumulated Impairment Loss 0 0  
Net Intangible Assets 4,994 6,122  
Finite-Lived Intangible Assets, Net [Abstract]      
Total 4,994 6,122  
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Cost 16,670 16,670  
Accumulated Amortization (9,887) (8,136)  
Accumulated Impairment Loss 0 0  
Net Intangible Assets 6,783 8,534  
Finite-Lived Intangible Assets, Net [Abstract]      
Total $ 6,783 $ 8,534