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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net income (Numerator)        
Net income available to common stockholders - basic $ 23,390 $ 22,941 $ 47,013 $ 44,299
Net income available to common stockholders - diluted $ 23,390 $ 22,941 $ 47,013 $ 44,299
Shares (Denominator)        
Weighted-Average Shares (Denominator) (shares) 79,604,673 79,549,097 79,595,599 79,539,789
Effect of Dilutive Securities:        
Stock options and performance units (shares) 30,089 20,778 30,074 24,155
Common stock warrants (shares) 0 38,530 0 46,712
Diluted EPS - common stock (shares) 79,634,762 79,608,405 79,625,673 79,610,656
Per Share (Amount)        
Basic EPS - common stock (in dollars per share) $ 0.29 $ 0.29 $ 0.59 $ 0.56
Diluted EPS - common stock (in dollars per share) $ 0.29 $ 0.29 $ 0.59 $ 0.56
Stock options and restricted shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive shares of common stock 451,670   445,113  
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive shares of common stock 19,552 19,013 19,552 19,013