Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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

Schedule of share-based compensation expenses

Total share-based compensation expenses were as follows (in thousands):

	For the Years Ended December 31,
	2014		2013		2012
Option plan	$	24,428	$	22,245	$	16,497
Other share-based awards	26,574		57,640		56,770
Total share-based compensation before tax	51,002		79,885		73,267
Tax benefit	19,039		29,835		27,401
Total share-based compensation expense included in net income	$	31,963	$	50,050	$	45,866

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following summarizes stock option activity and the weighted average exercise price for the following plans for the each of the three years ended December 31, 2014, 2013 and 2012:

	Omnibus Plan (Active)				Option Plan (Frozen)				Director Stock Option Plan (Frozen)
	Outstanding Shares		Weighted Average Exercise Price		Outstanding Shares		Weighted Average Exercise Price		Outstanding Shares		Weighted Average Exercise Price
Balance as of December 31, 2011	4,682,737		$	29.45	1,098,546		$	25.08	80,000		$	23.52
Granted	570,700		66.19		—		—		—		—
Exercised	(861,397	)	22.54		(744,974	)	25.84		(64,000	)	22.62
Forfeited	(61,630	)	40.95		—		—		—		—
Balance as of December 31, 2012	4,330,410		$	35.50	353,572		$	23.47	16,000		$	27.10
Granted	1,037,729		87.06		—		—		—		—
Exercised	(821,679	)	24.45		(191,141	)	23.23		(16,000	)	27.10
Forfeited	(80,380	)	47.55		—		—		—		—
Balance as of December 31, 2013	4,466,080		$	49.29	162,431		$	23.74	—		—
Granted	705,564		130.10		—		—		—		—
Exercised	(866,917	)	30.33		(96,398	)	23.77		—		—
Forfeited	(98,215	)	65.14		(2,800	)	22.43		—		—
Balance as of December 31, 2014	4,206,512		$	66.38	63,233		$	23.76	—		—
Vested or expected to vest as of December 31, 2014	4,206,512		$	66.38	63,233		$	23.76	—		—
Options exercisable as of December 31, 2014	1,640,169		$	32.52	63,233		$	23.76	—		—

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following assumptions were used to estimate the weighted average fair value of options of $39.97, $30.43, and $23.40 granted during the years ended December 31, 2014, 2013, and 2012, respectively:

	For the Years Ended December 31,
	2014		2013		2012
Weighted-average volatility	40	%	49	%	50	%
Expected dividend yield	1.5	%	1.9	%	2.2	%
Expected term (in years)	4.5		4.4		4.6
Weighted average risk free interest rate	1.6	%	0.9	%	0.7	%

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes restricted stock activity for the year ended December 31, 2014:

	Shares Outstanding		Weighted Average Grant Price
Balance as of December 31, 2013	770,967		$	74.47
Granted	407,626		134.34
Vested	(65,020	)	50.29
Canceled/Forfeited	(35,842	)	87.12
Balance as of December 31, 2014	1,077,731		$	98.15
Expected to vest as of December 31, 2014	895,243		$	94.80