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Intangible Assets, Net (Summary of Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization $ (86,990) $ (82,856)
Net Carrying Amount, Finite-Lived Intangible Assets 65,532  
Intangible assets, gross 156,661 155,556
Intangible assets, net 69,671 72,700
Capitalized Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-Lived Intangible Assets 143,812 142,358
Accumulated amortization (79,220) (74,530)
Net Carrying Amount, Finite-Lived Intangible Assets 64,592 67,828
Patents, Copyrights And Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-Lived Intangible Assets 6,489 6,438
Accumulated amortization (5,549) (5,471)
Net Carrying Amount, Finite-Lived Intangible Assets 940 967
Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount, Finite-Lived Intangible Assets 2,221 2,855
Accumulated amortization (2,221) (2,855)
Net Carrying Amount, Finite-Lived Intangible Assets 0 0
In Progress [Member]    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 3,843 3,616
Trademarks and Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 296 $ 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 6 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