Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Share-based Compensation [Abstract]

Schedule of Earnings Per Share Reconciliation

	Three Months Ended				Six Months Ended
	June 30, 2012		June 30, 2011		June 30, 2012		June 30, 2011
BASIC EPS:
Net income	$	30,585	$	29,763	$	60,929	$	57,324
Net income available to common shareholders	$	30,585	$	29,763	$	60,929	$	57,324
Average common shares outstanding	109,562		109,138		109,386		108,954
Basic net income per share	$	0.28	$	0.27	$	0.56	$	0.53
DILUTED EPS:
Income used in diluted earnings per share calculation	$	30,585	$	29,763	$	60,929	$	57,324
Average common shares outstanding	109,562		109,138		109,386		108,954
Equivalents from stock option plans	—		1		—		1
Average common and common stock equivalent shares outstanding	109,562		109,139		109,386		108,955
Diluted net income per share	$	0.28	$	0.27	$	0.56	$	0.53