Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Basic And Diluted Earnings Per Share

	Three Months Ended March  31,
	2012		2011
Net income	$	21,245	$	16,293
Weighted average common shares outstanding		72,854		72,704
Dilutive effect of stock-based awards		536		434
Shares used in computing diluted earnings per share		73,390		73,138
Basic earnings per share	$	0.29	$	0.22
Diluted earnings per share	$	0.29	$	0.22