Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Gross carrying amounts included in goodwill and intangible assets related to accumulated amortization and weighted average amortization periods (Details)

v3.6.0.2
Goodwill and Intangible Assets - Gross carrying amounts included in goodwill and intangible assets related to accumulated amortization and weighted average amortization periods (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 124,028 $ 193,368
Accumulated Amortization (37,895) (85,735)
Net Carrying Amount 86,133 107,633
License (Indefinite-lived) 4,427 4,427
Customer relationships    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount 120,000 120,000
Accumulated Amortization (36,593) (15,527)
Net Carrying Amount $ 83,407 $ 104,473
Weighted - Average Amortization Period (Years) 6 years 6 years
Backlog    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount   $ 70,000
Accumulated Amortization   (70,000)
Net Carrying Amount  
Weighted - Average Amortization Period (Years)   1 year
License    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 3,368 $ 3,368
Accumulated Amortization (807) (208)
Net Carrying Amount $ 2,561 $ 3,160
Weighted - Average Amortization Period (Years) 5 years 7 months 6 days 5 years 7 months 6 days
Non-compete agreements    
Schedule Of Intangible Assets [Line Items]    
Gross Carrying Amount $ 660  
Accumulated Amortization (495)  
Net Carrying Amount $ 165  
Weighted - Average Amortization Period (Years) 1 year