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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 551 878 938
Net Income (Loss) Attributable to Parent [Abstract]        
Net income attributable to common stockholders $ 56,164 $ 47,727 $ 299,347 $ 110,792
After tax interest on convertible debt 13 13 38 35
Net income — diluted $ 56,177 $ 47,740 $ 299,385 $ 110,827
Weighted average shares (denominator):        
Weighted average shares — basic (187,435) (193,274) (187,761) (193,999)
Convertible debt 121 121 121 121
Weighted average shares — diluted 192,243 196,567 192,417 197,175
Net income attributable to common stockholders, basic $ 0.30 $ 0.25 $ 1.59 $ 0.57
Net income attributable to common stockholders, diluted $ 0.29 $ 0.24 $ 1.56 $ 0.56
Equity Option [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Stock options 4,575 3,154 4,448 3,049
Restricted Stock Units (RSUs) [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Stock options 112 18 87 6
Equity Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 551 878 936
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 2