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Stockholders' Equity - Discussion of Equity and Warrants (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 07, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Jun. 21, 2019
Mar. 31, 2019
Sep. 20, 2018
Apr. 26, 2018
Mar. 31, 2018
Dec. 31, 2017
Equity [Abstract]                            
Total stockholders’ equity   $ 1,995,172,000 $ 1,903,211,000 $ 1,905,676,000 $ 1,995,172,000   $ 1,905,676,000 $ 1,903,211,000   $ 1,946,211,000     $ 1,945,333,000 $ 1,928,255,000
Class of Warrant or Right [Line Items]                            
Share repurchase program, authorized amount                 $ 50,000,000   $ 50,000,000 $ 100,000,000.0    
Common stock repurchased and recorded as treasury stock (in shares)     3,436,757   0 5,565,696   9,002,453            
Repurchase of treasury stock     $ 50,000,000.0 $ 78,961,000 $ 100,000,000.0   $ 78,961,000              
Dividends paid (in dollars per share)   $ 0.14   $ 0.13 $ 0.28   $ 0.26              
Convertible Notes                            
Class of Warrant or Right [Line Items]                            
Equity component of convertible notes       $ 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   $ 150,000,000.0            
Additional paid-in capital                            
Equity [Abstract]                            
Total stockholders’ equity   $ 1,425,262,000 $ 1,423,405,000 1,421,679,000 $ 1,425,262,000   $ 1,421,679,000 $ 1,423,405,000   $ 1,424,029,000     $ 1,405,806,000 $ 1,405,014,000
Class of Warrant or Right [Line Items]                            
Equity component of convertible notes after issuance costs       21,400,000                    
Convertible debt tax adjustment, reduction to additional paid-in capital       $ 6,400,000