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Net Income Per Share (Computation of Weighted Average Shares Outstanding Basic and Diluted) (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Common shares 20,414,667 21,402,969 20,413,238 21,978,263
Vested restricted stock units 532,160 485,622 525,609 772,605
Basic number of weighted average shares outstanding 20,946,827 21,888,591 20,938,847 22,750,868
Dilutive effect of stock options 0 0 0 4,393
Dilutive effect of restricted stock and restricted stock units 5,884 6,631 10,661 20,936
Dilutive number of weighted average shares outstanding 20,952,711 21,895,222 20,949,508 22,776,197
Stock Options, Restricted Stock Or Restricted Stock Units [Member]        
Shares outstanding excluded from calculation of diluted net income per share 0 0 0 0