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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income $ 15,239 $ 11,673 $ 47,884 $ 24,847
Denominator (in thousands):        
Weighted-average common shares for calculating basic earnings per share (shares) 48,261 28,243 48,324 28,242
Stock options and nonvested stock awards 28 0 21 0
Weighted-average common shares for calculating diluted earnings per share (shares) 48,289 28,243 48,345 28,242
Net income per share:        
Basic (in dollars per share) $ 0.32 $ 0.41 $ 0.99 $ 0.88
Diluted (in dollars per share) $ 0.32 $ 0.41 $ 0.99 $ 0.88