Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Share-based Compensation [Abstract]

Summary of Information Concerning Stock Options Outstanding Including the Related Transactions under the Stock Option Plans

				Weighted-
				Average
		Weighted-		Remaining	Aggregate
	Number	Average		Contractual	Intrinsic
	of Shares	Exercise		Term in	Value
	(in thousands)	Price		Years	(in thousands)
Options Outstanding as of December 31, 2016	31,507	$	19.40
Granted	1,503		27.01
Exercised	(11,914)		21.39
Forfeited and Expired	(234)		23.48
Options Outstanding as of June 30, 2017	20,862		18.77	4.80	$	235,389
Options Expected to Vest as of June 30, 2017	20,813		18.76	4.79		235,075
Options Exercisable as of June 30, 2017	16,139		17.61	3.65		200,826

Inputs Used for Valuation of Option Grants under Stock Option Plans

	Three months ended		Six months ended
	June 30,		June 30,
	2017	2016	2017			2016
Expected volatility	35.7%	40.2%	35.7%	-	36.1%	40.2%	-	43.1%
Weighted-average volatility	35.7%	40.2%	35.7%	-	36.1%	40.2%	-	43.1%
Expected dividends	2.11%	2.89%	2.11%	-	2.28%	2.89%	-	2.94%
Risk-free rate	2.2%	1.6%	2.2%	-	2.3%	1.5%	-	1.6%
Average risk-free rate	2.2%	1.6%	2.2%	-	2.3%	1.5%	-	1.6%
Expected term (in years)	7.4	7.4	7.4	-	7.4	7.4	-	7.4
Pre-vesting departure rate	0.6%	0.6%	0.6%	-	0.6%	0.6%	-	0.6%

Summary of the Status of Non-vested Time-based Restricted Stock and Restricted Stock Units

		Weighted
		Average
	Shares	Grant-Date
	(000’s)	Fair Value
Non-vested shares and share units at December 31, 2016	4,640	$	20.15
Granted	1,492		27.44
Vested	(1,068)		20.74
Forfeited	(66)		21.93
Non-vested shares and share units at June 30, 2017	4,998	$	22.18