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Net Income Per Share (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Common shares 20,364,435 21,739,300 23,180,633
Vested restricted stock units 527,260 517,804 670,156
Basic number of weighted average shares outstanding 20,891,695 22,257,104 23,850,789
Dilutive effect of stock options 0 3,293 31,180
Dilutive effect of restricted stock and restricted stock units 89,058 71,004 127,624
Weighted average shares outstanding: Diluted 20,980,753 22,331,401 24,009,593
Restricted stock outstanding excluded from calculation of diluted net income per share 0 0 0