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Earnings Per Share (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 07, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Jun. 21, 2019
USD ($)
Sep. 20, 2018
USD ($)
May 11, 2018
USD ($)
Apr. 26, 2018
USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share                        
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) | 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          
Net Income (Numerator)                        
Basic EPS - common stock | $   $ 42,681,000   47,530,000 85,439,000   98,762,000          
Diluted EPS - common stock | $   $ 42,681,000   $ 47,530,000 $ 85,439,000   $ 98,762,000          
Weighted-Average Shares (Denominator)                        
Basic EPS - common stock (in shares) | shares   126,658,509   133,061,304 126,649,536   134,283,216          
Effect of dilutive securities:                        
Stock options, restricted stock, and ESPP shares (in shares) | shares   211,946   291,537 193,334   293,528          
Diluted EPS - common stock (shares) | shares   126,870,455   133,352,841 126,842,870   134,576,744          
Earnings Per Share                        
Basic EPS - common stock (in dollars per share) | $ / shares   $ 0.34   $ 0.36 $ 0.67   $ 0.74          
Diluted EPS - common stock (in dollars per share) | $ / shares   $ 0.34   $ 0.36 $ 0.67   $ 0.73          
Convertible Notes                        
Antidilutive Securities Excluded from Computation of Earnings Per Share                        
Aggregate principal amount issued | $   $ 217,500,000   $ 217,500,000 $ 217,500,000   $ 217,500,000       $ 200,000,000  
Initial conversion rate 0.0450760 0.0450760                    
Repurchase of treasury stock | $ $ 76,000,000.0         $ 24,000,000.0   $ 150,000,000.0        
Stock options and restricted shares                        
Antidilutive Securities Excluded from Computation of Earnings Per Share                        
Antidilutive shares of common stock | shares   982,625   306,136 959,319   303,338          
Warrants                        
Antidilutive Securities Excluded from Computation of Earnings Per Share                        
Antidilutive shares of common stock | shares   0   20,673