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Convertible Senior Notes (Carrying Amounts of Liability and Equity Components) (Details) - Convertible Senior Notes [Member] - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Aug. 31, 2018
Jun. 30, 2014
2028 Convertible Senior Notes [Member]        
Debt Instrument [Line Items]        
Amount of the equity component [1] $ 327,305,000 $ 327,305,000    
Convertible senior notes 880,000,000 880,000,000 $ 880,000,000  
Unamortized debt discount [2] (313,498,000) (325,783,000)    
Unamortized transaction costs related to the debt component (9,719,000) (9,958,000)    
Contractual coupon interest accrual 15,009,000 5,867,000    
Contractual coupon interest payment (8,360,000)      
Net carrying amount 563,432,000 550,126,000    
2019 Convertible Senior Notes [Member]        
Debt Instrument [Line Items]        
Amount of the equity component [3] 9,196,000 9,196,000    
Convertible senior notes 65,978,000 65,987,000   $ 330,000,000
Unamortized debt discount   (1,063,000)    
Unamortized transaction costs related to the debt component   (176,000)    
Contractual coupon interest accrual 745,000 5,447,000    
Contractual coupon interest payment (745,000) (5,447,000)    
Net carrying amount $ 65,978,000 $ 64,748,000    
[1] Net of $6,163 thousands of transaction costs related to the equity component of the 2028 Notes.
[2] As of June 30, 2019, the remaining period over which the unamortized debt discount will be amortized is 9.2 years.
[3] Net of $236 thousands of transaction costs related to the equity component of the 2019 Notes.