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Financing Arrangements (Details) - Net Carrying Amount of the Liability Component and the Remaining Unamortized Debt Discount - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Carrying amount of the liability component $ 809,979 $ 994,033
Convertible Debt [Member]    
Debt Instrument [Line Items]    
Carrying amount of equity component 0 7,372
Carrying amount of the liability component 0 42,465
Unamortized discount of the liability component 0 750
Unamortized debt financing costs $ 0 $ 136