Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Details)

v3.10.0.1
Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]      
Balance, beginning balance $ 198,622 $ 198,622  
Increase from acquisitions 0 0  
Balance, ending balance 198,622 198,622 $ 198,622
Amortization of intangible assets 16,017 16,017 16,067
Finite-Lived Intangible Assets [Line Items]      
Cost 202,164 202,164  
Accumulated Amortization (106,247) (90,230)  
Accumulated Impairment Loss (1,025) (1,025)  
Net Intangible Assets 94,892 110,909  
Finite-Lived Intangible Assets, Net [Abstract]      
2019 15,953    
2020 15,362    
2021 14,998    
2022 13,252    
2023 9,252    
Thereafter 26,075    
Total 94,892 110,909  
Supply Chain Management      
Goodwill [Roll Forward]      
Balance, beginning balance 63,190 63,190  
Increase from acquisitions 0 0  
Balance, ending balance 63,190 63,190 63,190
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 (86,076) (72,937)  
Accumulated Impairment Loss (1,025) (1,025)  
Net Intangible Assets 85,993 99,132  
Finite-Lived Intangible Assets, Net [Abstract]      
Total 85,993 99,132  
Acquired technologies      
Finite-Lived Intangible Assets [Line Items]      
Cost 12,400 12,400  
Accumulated Amortization (8,533) (7,406)  
Accumulated Impairment Loss 0 0  
Net Intangible Assets 3,867 4,994  
Finite-Lived Intangible Assets, Net [Abstract]      
Total 3,867 4,994  
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Cost 16,670 16,670  
Accumulated Amortization (11,638) (9,887)  
Accumulated Impairment Loss 0 0  
Net Intangible Assets 5,032 6,783  
Finite-Lived Intangible Assets, Net [Abstract]      
Total $ 5,032 $ 6,783