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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income (Numerator)    
Net income available to common stockholders - basic $ 36,210 $ 23,623
Net income available to common stockholders - diluted $ 36,210 $ 23,623
Shares (Denominator)    
Weighted-Average Shares (Denominator) (shares) 135,248,018 79,583,188
Effect of Dilutive Securities:    
Stock options and performance units (shares) 520,627 30,057
Diluted EPS - common stock (shares) 135,768,645 79,613,245
Per Share (Amount)    
Basic EPS - common stock (in dollars per share) $ 0.27 $ 0.30
Diluted EPS - common stock (in dollars per share) $ 0.27 $ 0.30
Stock options and restricted shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive shares of common stock 236,878 443,956
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive shares of common stock 19,963 19,420