Net Income Per Share (Computation of Weighted Average Shares Outstanding Basic and Diluted) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Common shares	21,402,969	22,991,709	21,978,263	23,323,319
Vested restricted stock units	485,622	680,926	772,605	666,526
Basic number of weighted average shares outstanding	21,888,591	23,672,635	22,750,868	23,989,845
Dilutive effect of stock options	0	27,852	4,393	34,940
Dilutive effect of restricted stock and restricted stock units	6,631	7,556	20,936	22,658
Dilutive number of weighted average shares outstanding	21,895,222	23,708,043	22,776,197	24,047,443
Stock Options, Restricted Stock Or Restricted Stock Units [Member]
Shares outstanding excluded from calculation of diluted net income per share	0	0	0	0