Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Summary of Changes in Shareholders' Equity

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

			Additional								Deferred			Deferred
	Common		Paid-In-			Retained		Treasury			Compensation			Compensation
	Stock		Capital			Earnings		Stock			Trust			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		—		—			168,666		—			—			—			168,666
Deferred compensation activity		—		—			—		—			7,590			(7,590	)		—
Purchases of common stock for treasury		—		—			—		(435,809	)		—			—			(435,809	)
Equity-based compensation		—		30,385			—		—			—			—			30,385
Tax benefit from equity benefit plan activity		—		23,811			—		—			—			—			23,811
Proceeds from stock options exercised		—		7,564			—		—			—			—			7,564
Treasury stock issued upon option exercise and restricted share vesting		—		(22,806	)		—		22,806			—			—			—
Balance, September 30, 2013	$	206	$	1,208,653		$	4,507,746	$	(4,441,511	)	$	(17,741	)	$	17,741		$	1,275,094