Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Share-based Compensation [Abstract]

Schedule of Earnings Per Share Reconciliation

	Three Months Ended				Nine Months Ended
	September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
BASIC EPS:
Net income	$	34,953	$	31,737	$	95,882	$	89,060
Net income available to common shareholders	$	34,953	$	31,737	$	95,882	$	89,060
Average common shares outstanding	109,645		109,245		109,473		109,052
Basic net income per share	$	0.32	$	0.29	$	0.88	$	0.82
DILUTED EPS:
Income used in diluted earnings per share calculation	$	34,953	$	31,737	$	95,882	$	89,060
Average common and common stock equivalent shares outstanding	109,645		109,246		109,473		109,053
Diluted net income per share	$	0.32	$	0.29	$	0.88	$	0.82