Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option activity

Activity for the 04 Plan, the 07 Incentive Plan and awards made outside of share-based compensation plans for the years ended December 31, 2013, 2012 and 2011, is presented below (in thousands, except per common share data):

	Market Condition (Performance-Based) Awards				Service Period Awards				Total
	Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Balance as of December 31, 2010	112		$	43.40	222		$	36.72	334		$	38.96
Granted	—		$	—	156		$	42.95	156		$	42.95
Vested	—		$	—	(70	)	$	42.41	(70	)	$	42.21
Canceled/forfeited	—		$	—	(1	)	$	35.81	(1	)	$	35.81
Balance as of December 31, 2011	112		$	43.76	307		$	38.63	419		$	40.01
Granted	—		$	—	182		$	51.99	182		$	51.99
Vested	(52	)	$	41.31	(169	)	$	45.85	(221	)	$	44.77
Canceled/forfeited	—		$	—	(1	)	$	39.12	(1	)	$	39.12
Balance as of December 31, 2012	60		$	45.90	319		$	42.42	379		$	42.97
Granted	324		$	53.71	287		$	67.55	611		$	60.21
Vested	(60	)	$	45.90	(256	)	$	59.54	(316	)	$	53.90
Canceled/forfeited	—		$	—	(1	)	$	38.75	(1	)	$	38.75
Balance as of December 31, 2013	324		$	53.71	349		$	53.58	673		$	53.64

Activity for stock options granted by the Company during the years ended December 31, 2013, 2012 and 2011 is presented below (in thousands, except per common share data):

	Number of Shares Under Option		Weighted Average Exercise Price
Balance as of December 31, 2010	360		$	36.36
Granted	—		$	—
Exercises	(6	)	$	27.23
Canceled/forfeited	—		$	—
Balance as of December 31, 2011	354		$	36.52
Granted	—		$	—
Exercises	(153	)	$	36.80
Canceled/forfeited	—		$	—
Balance as of December 31, 2012	201		$	36.30
Granted	—		$	—
Exercises	(7	)	$	42.94
Canceled/forfeited	(1	)	$	36.12
Balance as of December 31, 2013	193		$	36.04

Disclosure of share based compensation award activity

The following table summarizes information about stock options outstanding as of December 31, 2013 (in thousands, except contractual life and per share data):

	Shares Under Option	Remaining Contractual Life	Average Exercise Price Per Share		Intrinsic Value per Share(1)		Aggregate Intrinsic Value
Options exercisable and vested at December 31, 2013	193	3.0	$	36.04	$	53.61	$	10,358

(1) Computed based upon the amount by which the fair market value of the Company’s common stock at December 31, 2013, of $89.65 per share exceeded the weighted average exercise price.

estimates the fair value of the stock options as of the date of grant, using the Black-Scholes option pricing model.