Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

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, 2014	$	206	$	1,325,495		$	4,887,187	$	(5,088,633	)	$	(17,333	)	$	17,333	$	1,124,255
Net income		—		—			132,453		—			—			—		132,453
Purchase of common stock for treasury		—		—			—		(69,285	)		—			—		(69,285	)
Equity-based compensation		—		26,303			—		—			—			—		26,303
Tax benefit from equity benefit plan   activity		—		9,899			—		—			—			—		9,899
Proceeds from stock options exercised		—		51,256			—		—			—			—		51,256
Treasury stock issued upon option   exercise and restricted share vesting		—		(23,228	)		—		23,228			—			—		—
Balance, June 30, 2015	$	206	$	1,389,725		$	5,019,640	$	(5,134,690	)	$	(17,333	)	$	17,333	$	1,274,881