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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Document Period End Date     Sep. 30, 2018  
Net Income (Loss) Attributable to Parent [Abstract]        
Net income attributable to common stockholders $ 68,935 $ 56,164 $ 254,162 $ 299,347
After tax interest on convertible debt 15 13 45 38
Net income — diluted $ 68,950 $ 56,177 $ 254,207 $ 299,385
Weighted average shares (denominator):        
Weighted average shares — basic (180,858) (187,435) (182,859) (187,761)
Convertible debt 121 121 121 121
Weighted average shares — diluted 185,460 192,243 187,517 192,417
Net income attributable to common stockholders, basic $ 0.38 $ 0.30 $ 1.39 $ 1.59
Net income attributable to common stockholders, diluted $ 0.37 $ 0.29 $ 1.36 $ 1.56
Equity Option [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Stock options 4,284 4,575 4,364 4,448
Restricted Stock Units (RSUs) [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Stock options 197 112 173 87
Equity Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 831 0 980 878