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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income $ 32,645 $ 13,174
Denominator (in thousands):    
Weighted-average common shares for calculating basic earnings per share (shares) 48,389 28,241
Stock options and nonvested awards (shares) 13 0
Weighted-average common shares for calculating diluted earnings per share (shares) 48,402 28,241
Net income per share:    
Basic (in dollars per share) $ 0.67 $ 0.47
Diluted (in dollars per share) $ 0.67 $ 0.47