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Goodwill and Intangible Assets, Net (Summary of Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization $ (95,402) $ (82,856)  
Net carrying amount of finite-lived intangible assets 53,723    
Intangible assets, gross 151,829 155,556  
Intangible assets, net $ 56,427 72,700  
Impairment of discontinued project   0 $ 0
Weighted average remaining useful life of intangible assets 6 years 6 months    
Capitalized Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of finite-lived intangible assets $ 143,275 142,358  
Accumulated amortization (90,219) (74,530)  
Net carrying amount of finite-lived intangible assets 53,056 67,828  
Patents, Copyrights And Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of finite-lived intangible assets 5,636 6,438  
Accumulated amortization (4,969) (5,471)  
Net carrying amount of finite-lived intangible assets 667 967  
Other [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount of finite-lived intangible assets 214 2,855  
Accumulated amortization (214) (2,855)  
Net carrying amount of finite-lived intangible assets 0 0  
In Progress [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets 2,378 3,616  
Impairment of discontinued project 4,754    
Trademarks and Other [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets $ 326 $ 289  
Minimum [Member] | Capitalized Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Useful life 2 years    
Minimum [Member] | Patents, Copyrights And Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Useful life 7 years    
Maximum [Member] | Capitalized Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Useful life 7 years    
Maximum [Member] | Patents, Copyrights And Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Useful life 25 years