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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Basic [Abstract]        
Net income $ 68,960 $ 80,362 $ 131,860 $ 141,384
Non-forfeitable dividends on unvested restricted shares (174) (90) (309) (139)
Net income attributable to the Company’s common stockholders for basic earnings per share $ 68,786 $ 80,272 $ 131,551 $ 141,245
Weighted average number shares outstanding – basic 298,140 302,776 298,372 303,468
Net income per share (usd per share) $ 0.23 $ 0.27 $ 0.44 $ 0.47
Computation of Diluted Earnings Per Share:        
Net income attributable to the Company’s common stockholders for diluted earnings per share $ 68,786 $ 80,272 $ 131,551 $ 141,245
Equity awards (in shares) 753 158 523 146
Weighted average shares outstanding - diluted (in shares) 298,893 302,934 298,895 303,614
Net income per share (usd per share) $ 0.23 $ 0.26 $ 0.44 $ 0.47