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Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Stock Option Activity

A summary of stock option activity is as follows:

Stock Options		Number of Shares				Weighted- Average Exercise Price ($)				Weighted- Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value of In-the-Money Options ($)
Outstanding as of December 31, 2018			4,864,836			$	17.76
Exercised			(313,282	)			15.50
Forfeited			(3,496	)			17.89
Outstanding as of March 31, 2019			4,548,058			$	17.91				6.02			$	68,018,687
Exercisable as of March 31, 2019			3,946,163			$	17.58				5.80			$	60,350,648

Summary of Nonvested Restricted Share Awards

A summary of nonvested restricted share awards (“RSAs”) is as follows:

Nonvested Restricted Share Awards		Number of Shares				Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2018			213,337			$	20.21
Vested			(98,769	)			20.12
Forfeited			(3,975	)			20.12
Nonvested as of March 31, 2019			110,593			$	20.29

Black-Scholes Option-Pricing Model [Member]

Summary of Grant Date Fair Value Weighted-Average Assumptions

The fair value of options granted during the three months ended March 31, 2018, were estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, Compensation – Stock Compensation (“ASC 718”), with the following weighted-average assumptions:

		Three Months Ended
		March 31, 2018
Expected life (years)			5.6
Risk-free interest rate			2.7	%
Expected volatility			26.4	%
Expected dividend yield			—

LTIP Performance Shares [Member]

Summary of Nonvested Performance Award Activity

A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) is as follows:

Nonvested LTIP Performance Shares		Number of Shares at Expected Attainment				Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2018			540,697			$	19.83
Forfeited			(1,036	)			20.12
Nonvested as of March 31, 2019			539,661			$	19.83

Total Shareholder Return Awards (TSRs) [Member]

Summary of Nonvested Performance Award Activity

A summary of nonvested total shareholder return awards (“TSRs”) is as follows:

Nonvested Total Shareholder Return Awards		Number of Shares				Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2018			718,931			$	29.25
Granted			436,674				47.90
Forfeited			(5,457	)			31.31
Nonvested as of March 31, 2019			1,150,148			$	36.32

Total Shareholder Return Awards (TSRs) [Member] | Monte Carlo Simulation Model [Member]

Summary of Grant Date Fair Value Weighted-Average Assumptions

The fair value of TSRs granted during the three months ended March 31, 2019 and 2018, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, using the following weighted-average assumptions:

		Three Months Ended March 31,
		2019				2018
Expected life (years)			2.8				2.9
Risk-free interest rate			2.5	%			2.4	%
Expected volatility			29.3	%			28.0	%
Expected dividend yield			—				—

Restricted Share Units (RSUs) [Member]

Summary of Nonvested Restricted Share Unit Activity

A summary of nonvested restricted share unit awards (“RSUs”) is as follows:

Nonvested Restricted Share Units		Number of Shares				Weighted- Average Grant Date Fair Value
Nonvested as of December 31, 2018			651,045			$	23.82
Granted			550,091				33.07
Vested			(173,547	)			23.36
Forfeited			(8,346	)			23.36
Nonvested as of March 31, 2019			1,019,243			$	28.90

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards other than stock options, including, but not limited to: (a) expected term of share awards and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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