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Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 18,771 $ 12,316 $ 33,354 $ 24,483
Average Common Shares:        
Basic (weighted-average outstanding shares) 11,652 11,547 11,629 11,509
Dilutive potential common shares from stock options (in shares) 107 124 120 137
Diluted (weighted-average outstanding shares) 11,759 11,671 11,749 11,646
Basic earnings per share (in dollars per share) $ 1.61 $ 1.07 $ 2.87 $ 2.13
Diluted earnings per share (in dollars per share) $ 1.60 $ 1.05 $ 2.84 $ 2.10