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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic EPS [Abstract]    
Weighted average common shares outstanding (in shares) 43,342,000 44,153,000
Net income available to common stockholders $ 18,891 $ 18,166
Basic EPS (in dollars per share) $ 0.44 $ 0.41
Diluted EPS [Abstract]    
Weighted average common shares outstanding (in shares) 43,342,000 44,153,000
Dilutive effect of common stock options and restricted stock (in shares) 365,000 489,000
Weighted average common shares and common share equivalents (in shares) 43,707,000 44,642,000
Net income available to common stockholders $ 18,891 $ 18,166
Diluted EPS (in dollars per share) $ 0.43 $ 0.41
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stock options excluded from calculation of diluted EPS (in shares) 30,861 461,611