Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015		2014		2013
Option plan	$	26,191	$	24,428	$	22,245
Other share-based awards	23,275		26,574		57,640
Total share-based compensation before tax	49,466		51,002		79,885
Tax benefit	18,451		19,039		29,835
Total share-based compensation expense included in net income	$	31,015	$	31,963	$	50,050

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, 2015, 2014 and 2013:

	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, 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	—		—
Granted	743,062		150.81		—		—		—		—
Exercised	(706,750	)	40.21		(44,283	)	23.92		—		—
Forfeited	(137,285	)	112.95		—		—		—		—
Balance as of December 31, 2015	4,105,539		$	84.61	18,950		$	23.37	—		—
Vested or expected to vest as of December 31, 2015	4,105,539		$	84.61	18,950		$	23.37	—		—
Options exercisable as of December 31, 2015	1,990,346		$	48.05	18,950		$	23.37	—		—

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 $37.64, $39.97 and $30.43 granted during the years ended December 31, 2015, 2014 and 2013, respectively:

	For the Years Ended December 31,
	2015		2014		2013
Weighted-average volatility	32	%	40	%	49	%
Expected dividend yield	1.4	%	1.5	%	1.9	%
Expected term (in years)	4.5		4.5		4.4
Weighted average risk free interest rate	1.5	%	1.6	%	0.9	%

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, 2015:

	Shares Outstanding		Weighted Average Grant Price
Balance as of December 31, 2014	1,077,731		$	98.15
Granted	476,556		139.50
Vested	(358,966	)	72.56
Canceled/Forfeited	(64,554	)	126.64
Balance as of December 31, 2015	1,130,767		$	122.08
Expected to vest as of December 31, 2015	765,271		$	121.25