Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2011

Shareholders' Equity [Abstract]

Summary of changes in shareholders' equity

			Additional								Deferred			Deferred
	Common		Paid-In			Retained		Treasury			Comp.			Comp.
	Stock		Capital			Earnings		Stock			Trust			Liability			Total
Balance, December 31, 2010	$	206	$	951,234		$	4,029,072	$	(3,240,138	)	$	(27,582	)	$	27,582		$	1,740,374
Net income		—		—			53,619		—			—			—			53,619
Deferred compensation activity		—		—			—		—			2,000			(2,000	)		—
Purchase of common stock for treasury		—		—			—		(300,885	)		—			—			(300,885	)
Equity-based compensation		—		31,705			—		—			—			—			31,705
Tax benefit from stock options exercised and deferred compensation distributions		—		21,391			—		—			—			—			21,391
Proceeds from stock options exercised		—		104,592			—		—			—			—			104,592
Treasury stock issued upon option exercise		—		(71,623	)		—		71,623			—			—			—
Balance, June 30, 2011	$	206	$	1,037,299		$	4,082,691	$	(3,469,400	)	$	(25,582	)	$	25,582		$	1,650,796