Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Earnings Per Common Share

The computation of basic and diluted earnings per common share is as follows:

	Year Ended December 31,
	2012			2011			2010
	(In thousands, except per share amounts)
Computation of Basic Earnings Per Share:
Net income	$	120,687		$	110,396		$	107,441
Income allocated to participating securities	(1,272		)	(1,099		)	(1,109		)
Net income available to common shareholders	$	119,415		$	109,297		$	106,332
Weighted average common shares outstanding—basic	57,467			58,862			58,953
Basic earnings per share	$	2.08		$	1.86		$	1.80
Computation of Diluted Earnings Per Share:
Net income	$	120,687		$	110,396		$	107,441
Income allocated to participating securities	(1,289		)	(1,098		)	(1,108		)
Net income available to common shareholders	$	119,398		$	109,298		$	106,333
Weighted average common shares outstanding—basic	57,467			58,862			58,953
Diluted effect of stock options and PVRSUs	186			72			88
Weighted average shares outstanding-diluted	57,653			58,934			59,041
Diluted earnings per share	$	2.07		$	1.85		$	1.80