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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic earnings per share [Abstract]      
Net income $ 76,425 $ 75,074 $ 61,747
Weighted average shares, basic (in shares) 43,836,000 43,877,000 41,930,000
Basic EPS (in dollars per share) $ 1.74 $ 1.71 $ 1.47
Diluted earnings per share [Abstract]      
Net income available to common shareholders $ 76,425 $ 75,074 $ 61,747
Dilutive effect of stock based compensation (in shares) 553,000 518,000 420,000
Weighted average shares, diluted (in shares) 44,389,000 44,395,000 42,350,000
Diluted EPS (in dollars per share) $ 1.72 $ 1.69 $ 1.46
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options excluded from calculation of diluted EPS (in shares) 30,000 493,000 1,048,000