Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Computation Of Basic Earnings And Diluted Earnings Per Share Data

	Years Ended December 31,
	2011		2010		2009
Numerator for basic and diluted earnings per share
Net income	$	27,557	$	25,054	$	27,010
Denominator:
Weighted-average basic common shares outstanding		31,267		34,075		35,240
Assumed conversion of dilutive securities:
Stock options		1,887		1,453		1,384
Denominator for diluted earnings per share — Adjusted weighted-average shares		33,154		35,528		36,624
Earnings per common share:
Basic	$	0.88	$	0.74	$	0.77
Diluted	$	0.83	$	0.71	$	0.74