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Stockholders' Equity - Discussion of Equity and Warrants (Details) - USD ($)
6 Months Ended 12 Months Ended
Apr. 26, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Dec. 31, 2016
Stockholders’ Equity and Regulatory Matters [Abstract]              
Stockholders' equity   $ 1,903,211,000 $ 2,036,011,000 $ 1,903,211,000 $ 1,928,255,000   $ 1,855,473,000
Class of Warrant or Right [Line Items]              
Adjustment to additional paid-in capital from convertible notes issued     $ 0 $ 15,045,000 0    
Share repurchase program, authorized amount           $ 50,000,000.0  
Common stock repurchased and recorded as treasury stock (in shares)     943,094 9,002,453      
Repurchase of treasury stock     $ 13,820,000 $ 150,000,000      
Additional paid-in capital              
Stockholders’ Equity and Regulatory Matters [Abstract]              
Stockholders' equity   1,423,405,000 $ 1,428,066,000 1,423,405,000 $ 1,405,014,000   $ 1,400,490,000
Class of Warrant or Right [Line Items]              
Adjustment to additional paid-in capital from convertible notes issued       21,400,000      
Tax adjustment on equity component of convertible notes, reduction to additional paid-in capital       6,400,000      
Convertible Notes              
Class of Warrant or Right [Line Items]              
Equity component of convertible notes, net of taxes   21,900,000   21,900,000      
Issuance costs from convertible notes allocated to equity   461,000   $ 461,000      
Repurchase of treasury stock $ 76,000,000.0 $ 24,000,000.0