Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Restricted Stock Awards ("RSAs")

Restricted Stock Awards (“RSAs”) generally vest in annual installments between one and three years from each grant date. The following table provides a summary of RSAs for the three months ended March 31, 2018:

	Number of Shares			Weighted-Average Grant Date Fair Value
Unvested at January 1, 2018		461,639		$	26.47
Granted		271,173			26.08
Vested		(129,291	)		26.30
Forfeited		(8,025	)		26.11
Unvested at March 31, 2018		595,496		$	26.33

Schedule of Performance Stock Units ("PSUs")

The following table provides a summary of PSUs for the three months ended March 31, 2018:

	Number of Shares			Weighted-Average Grant Date Fair Value
Unvested at January 1, 2018		371,557		$	31.96
Granted		179,485			29.44
Vested		—			—
Forfeited		(11,060	)		30.44
Unvested at March 31, 2018		539,982		$	31.15

Schedule of Grant Date Fair Values of Awards Using Monte Carlo Simulation Valuation Model

The grant date fair values of these awards were determined using a Monte Carlo simulation valuation model with the following assumptions:

Expected volatility(1)		24.0	%
Dividend yield(2)		—
Risk-free rate		2.4	%
Expected term	2-3 years

⁽¹⁾ Due to limited trading history of our common stock, we used the historical and implied volatilities of our peer group in addition to our historical and implied volatilities over the performance period to estimate appropriate expected volatilities.

⁽²⁾ Dividends are assumed to be reinvested in shares of our common stock and dividends will not be paid unless shares vest.