Net Income Per Share (Computation of Weighted Average Shares Outstanding Basic and Diluted) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Common shares	20,414,667	22,167,771	20,412,511	22,356,299
Vested restricted stock units	532,160	485,622	522,279	765,989
Basic number of weighted average shares outstanding	20,946,827	22,653,393	20,934,790	23,122,288
Dilutive effect of stock options	0	0	0	6,646
Dilutive effect of restricted stock and restricted stock units	5,005	5,498	14,258	28,355
Dilutive number of weighted average shares outstanding	20,951,832	22,658,891	20,949,048	23,157,289
Stock Options, Restricted Stock Or Restricted Stock Units [Member]
Shares outstanding excluded from calculation of diluted net income per share	0	0	0	0