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Long-term Debt - Convertible Note Hedges and Warrants (Details)
$ / shares in Units, $ in Thousands, shares in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Debt Instrument [Line Items]  
Expiration Period for Notes Warrants in Trading Days 100 days
Proceeds from issuance of warrants on convertible notes $ 12,060
Convertible Note Hedges | Convertible Senior Notes Due 2023  
Debt Instrument [Line Items]  
Conversion option to acquire shares (in shares) | shares 3.8
Strike price (in dollars per share) | $ / shares $ 37.60
Cost of purchase of hedges on convertible notes $ 20,700
Deferred tax amount 5,300
Convertible Debt | Convertible Senior Notes Due 2023  
Debt Instrument [Line Items]  
Debt discount for conversion option $ 20,900
Warrants related to the issuance of convertible senior notes | Convertible Senior Notes Due 2023  
Debt Instrument [Line Items]  
Warrant exercise price (in dollars per share) | $ / shares $ 46.62
Warrants related to the issuance of convertible senior notes | Convertible Debt  
Debt Instrument [Line Items]  
Proceeds from issuance of warrants on convertible notes $ 12,100