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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic EPS [Abstract]        
Weighted average common shares outstanding (in shares) 43,692,000 43,882,000 43,949,000 43,847,000
Net income $ 19,851 $ 10,912 $ 57,298 $ 56,561
Basic EPS (in dollars per share) $ 0.45 $ 0.25 $ 1.30 $ 1.29
Diluted EPS [Abstract]        
Weighted average common shares outstanding (in shares) 43,692,000 43,882,000 43,949,000 43,847,000
Dilutive effect of common stock options and restricted stock (in shares) 570,000 523,000 519,000 507,000
Weighted average common shares and common share equivalents (in shares) 44,262,000 44,405,000 44,468,000 44,354,000
Net income $ 19,851 $ 10,912 $ 57,298 $ 56,561
Diluted EPS (in dollars per share) $ 0.45 $ 0.25 $ 1.29 $ 1.28
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options excluded from calculation of diluted EPS (in shares) 36,360 501,843 334,759 502,836