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Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2014
Debt Instrument [Line Items]      
Temporary equity $ 8,110 $ 0  
Additional paid-in capital 5,404,500 4,883,670  
Senior Notes Due 2019      
Debt Instrument [Line Items]      
Principal 1,164,497 1,437,483  
Less: note discount and issuance costs (9,052) (51,159)  
Net carrying amount 1,155,445 1,386,324 $ 1,440,000
Temporary equity 8,110 0  
Additional paid-in capital 127,374 162,869  
Total (including temporary equity) $ 135,484 $ 162,869