Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Summary of Changes in Shareholders' Equity

A summary of changes in shareholders’ equity is presented below:

	Common Stock		Additional Paid-In- Capital			Retained Earnings		Treasury Stock			Deferred Compensation Trust			Deferred Compensation Liability			Total
Balance, December 31, 2012	$	206	$	1,169,699		$	4,339,080	$	(4,028,508	)	$	(25,331	)	$	25,331		$	1,480,477
Net income		—		—			85,731		—			—			—			85,731
Deferred compensation activity		—		—			—		—			7,590			(7,590	)		—
Purchase of common stock for treasury		—		—			—		(294,979	)		—			—			(294,979	)
Equity-based compensation		—		18,652			—		—			—			—			18,652
Tax benefit from equity benefit plan activity		—		23,727			—		—			—			—			23,727
Proceeds from stock options exercised		—		6,671			—		—			—			—			6,671
Treasury stock issued upon option exercise and restricted share vesting		—		(22,364	)		—		22,364			—			—			—
Balance, June 30, 2013	$	206	$	1,196,385		$	4,424,811	$	(4,301,123	)	$	(17,741	)	$	17,741		$	1,320,279