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Convertible Subordinated Notes Convertible Subordinated Notes (Liability and Equity Components) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Mar. 19, 2014
Debt Instrument [Line Items]      
Principal amount $ 208,466,000    
Unamortized discount of liability component (25,754,000)    
Convertible subordinated notes      
Debt Instrument [Line Items]      
Principal amount 143,750,000 $ 143,750,000 $ 143,750,000
Unamortized discount of liability component (25,754,000) (29,208,000)  
Carrying value of the liability component 117,996,000 114,542,000  
Equity component carrying value $ 17,973,000 $ 17,973,000