Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Details)

v3.6.0.2
Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]      
Balance, beginning balance $ 198,545 $ 92,052  
Increase from acquisitions 77 106,493  
Balance, ending balance 198,622 198,545 $ 92,052
Amortization of intangible assets 16,067 15,576 10,048
Finite-Lived Intangible Assets [Line Items]      
Cost 202,164 202,214  
Accumulated Amortization (74,213) (58,146)  
Accumulated Impairment Loss (1,025) (1,025)  
Net Intangible Assets 126,926 143,043  
Finite-Lived Intangible Assets, Net [Abstract]      
2017 16,017    
2018 16,017    
2019 15,953    
2020 15,362    
2021 14,998    
Thereafter 48,579    
Total 126,926 143,043  
Supply Chain Management      
Goodwill [Roll Forward]      
Balance, beginning balance 63,113 61,169  
Increase from acquisitions 77 1,944  
Balance, ending balance 63,190 63,113 61,169
IT, Energy and Management Consulting      
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 0  
Increase from acquisitions 0 104,549  
Balance, ending balance 104,549 104,549 $ 0
Contract and customer-related      
Finite-Lived Intangible Assets [Line Items]      
Cost 173,094 173,084  
Accumulated Amortization (59,799) (46,611)  
Accumulated Impairment Loss (1,025) (1,025)  
Net Intangible Assets 112,270 125,448  
Finite-Lived Intangible Assets, Net [Abstract]      
Total 112,270 125,448  
Acquired technologies      
Finite-Lived Intangible Assets [Line Items]      
Cost 12,400 12,400  
Accumulated Amortization (6,278) (5,151)  
Accumulated Impairment Loss 0 0  
Net Intangible Assets 6,122 7,249  
Finite-Lived Intangible Assets, Net [Abstract]      
Total 6,122 7,249  
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Cost 16,670 16,730  
Accumulated Amortization (8,136) (6,384)  
Accumulated Impairment Loss 0 0  
Net Intangible Assets 8,534 10,346  
Finite-Lived Intangible Assets, Net [Abstract]      
Total $ 8,534 $ 10,346