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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income (Numerator)    
Net income available to common stockholders - basic $ 23,623 $ 21,358
Net income available to common stockholders - diluted $ 23,623 $ 21,358
Shares (Denominator)    
Weighted-Average Shares (Denominator) (shares) 79,583,188 79,526,218
Effect of Dilutive Securities:    
Stock options and performance units (shares) 30,057 27,359
Common stock warrants (shares) 0 48,545
Diluted EPS - common stock (shares) 79,613,245 79,602,122
Per Share (Amount)    
Basic EPS - common stock (in dollars per share) $ 0.30 $ 0.27
Diluted EPS - common stock (in dollars per share) $ 0.30 $ 0.27
Stock options and restricted shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive shares of common stock 443,956  
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share    
Antidilutive shares of common stock 19,420 18,882