Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2012

Shareholders' Equity [Abstract]

Summary of changes in shareholders' equity

	Common Stock		Additional Paid-In Capital			Retained Earnings		Treasury Stock			Deferred Comp. Trust			Deferred Comp. Liability			Total
Balance, December 31, 2011	$	206	$	1,072,779		$	4,158,492	$	(3,856,678	)	$	(25,581	)	$	25,581		$	1,374,799
Net income		—		—			20,123		—			—			—			20,123
Deferred compensation activity		—		—			—		—			250			(250	)		—
Equity-based compensation		—		16,440			—		—			—			—			16,440
Tax benefit from equity benefit plan activity		—		876			—		—			—			—			876
Proceeds from stock options exercised		—		6,003			—		—			—			—			6,003
Treasury stock issued upon option exercise		—		(21,883	)		—		21,883			—			—			—
Balance, March 31, 2012	$	206	$	1,074,215		$	4,178,615	$	(3,834,795	)	$	(25,331	)	$	25,331		$	1,418,241