Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018		2017		2016
Option awards	$	23,393	$	18,423	$	23,876
Other share-based awards	28,513		28,844		23,368
Total share-based compensation before tax	51,906		47,267		47,244
Tax benefit	12,354		17,555		17,546
Total share-based compensation expense included in net income	$	39,552	$	29,712	$	29,698

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, 2018, 2017 and 2016:

	Omnibus Plan (Active)				Option Plan (Frozen)
	Shares Outstanding		Weighted Average Exercise Price		Outstanding Shares		Weighted Average Exercise Price
Balance as of December 31, 2015	4,105,539		$	84.61	18,950		$	23.37
Granted	1,326,430		78.72		—		—
Exercised	(348,206	)	40.51		(18,950	)	23.37
Forfeited	(366,702	)	108.90		—		—
Balance as of December 31, 2016	4,717,061		$	84.32	—		—
Granted	1,267,812		88.22		—		—
Exercised	(898,417	)	44.18		—		—
Forfeited	(192,505	)	108.15		—		—
Balance as of December 31, 2017	4,893,951		$	91.78	—		—
Granted	806,698		115.43		—		—
Exercised	(724,124	)	61.49		—		—
Forfeited	(400,599	)	105.70		—		—
Balance as of December 31, 2018	4,575,926		$	99.53	—		—
Vested or expected to vest as of December 31, 2018	4,575,926		$	99.53	—		—
Options exercisable as of December 31, 2018	1,909,271		$	99.47	—		—

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 $26.50, $18.45 and $16.81 granted during the years ended December 31, 2018, 2017 and 2016, respectively:

	For the Years Ended December 31,
	2018		2017		2016
Weighted-average volatility	30	%	29	%	32	%
Expected dividend yield	2.1	%	2.6	%	2.8	%
Expected term (in years)	4.4		4.7		4.5
Weighted average risk free interest rate	2.6	%	1.9	%	1.4	%

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, 2018:

	Shares Outstanding		Weighted Average Grant Price
Balance as of December 31, 2017	1,620,625		$	93.03
Granted	582,488		114.42
Vested	(158,031	)	101.95
Canceled/Forfeited	(403,885	)	123.80
Balance as of December 31, 2018	1,641,197		$	92.19
Expected to vest as of December 31, 2018	1,282,659		$	98.28