Net Income Per Share (Computation of Weighted Average Shares Outstanding Basic and Diluted) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Common shares	20,159,197	20,414,667	20,094,542	20,412,511
Vested restricted stock units	220,360	532,160	312,837	522,279
Basic number of weighted average shares outstanding	20,379,557	20,946,827	20,407,379	20,934,790
Dilutive effect of restricted stock and restricted stock units	3,247	5,005	26,145	14,258
Dilutive number of weighted average shares outstanding	20,382,804	20,951,832	20,433,524	20,949,048
Shares outstanding excluded from calculation of diluted net income per share	0	0	7,426	0