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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings per Share    
Adjustments to net income (in dollars) $ 0 $ 0
Antidilutive securities (in shares) 0 0
Numerator:    
Net income $ 67,958 $ 56,740
Denominator:    
Basic: weighted-average shares outstanding (in shares) 139,600,712 139,545,728
Add: weighted-average equity-based awards (in shares) 131,388 91,682
Diluted: weighted-average shares outstanding (in shares) 139,732,100 139,637,410
Basic earnings per share (in dollars per share) $ 0.49 $ 0.41
Diluted earnings per share (in dollars per share) $ 0.49 $ 0.41