Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details)

v3.5.0.2
Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Goodwill [Roll Forward]          
Balance as of beginning of period     $ 198,545    
Balance as of end of period $ 198,545   198,545    
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets 4,000 $ 4,100 8,000 $ 7,700  
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 202,214   202,214   $ 202,214
Accumulated Amortization (66,187)   (66,187)   (58,146)
Accumulated Impairment Loss (1,025)   (1,025)   (1,025)
Net Intangible Assets 135,002   135,002   143,043
Supply Chain Management Group [Member]          
Goodwill [Roll Forward]          
Balance as of beginning of period     63,113    
Balance as of end of period 63,113   63,113    
IT, Energy and Management Consulting [Member]          
Goodwill [Roll Forward]          
Balance as of beginning of period     30,883    
Balance as of end of period 30,883   30,883    
Aviation Group [Member]          
Goodwill [Roll Forward]          
Balance as of beginning of period     104,549    
Balance as of end of period 104,549   104,549    
Contract and Customer-Related [Member]          
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 173,084   173,084   173,084
Accumulated Amortization (53,211)   (53,211)   (46,611)
Accumulated Impairment Loss (1,025)   (1,025)   (1,025)
Net Intangible Assets 118,848   118,848   125,448
Acquired Technologies [Member]          
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 12,400   12,400   12,400
Accumulated Amortization (5,715)   (5,715)   (5,151)
Accumulated Impairment Loss 0   0   0
Net Intangible Assets 6,685   6,685   7,249
Trade Names - Amortizable [Member]          
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 16,730   16,730   16,730
Accumulated Amortization (7,261)   (7,261)   (6,384)
Accumulated Impairment Loss 0   0   0
Net Intangible Assets $ 9,469   $ 9,469   $ 10,346