Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 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 nine months ended September 30, 2018:

	Number of Shares			Weighted-Average Grant Date Fair Value
Unvested at January 1, 2018		461,639		$	26.47
Granted		318,832			26.68
Vested		(210,045	)		26.68
Forfeited		(10,891	)		26.13
Unvested at September 30, 2018		559,535		$	26.51

Schedule of Performance Stock Units ("PSUs")

The following table provides a summary of PSUs for the nine months ended September 30, 2018:

	Number of Shares			Weighted-Average Grant Date Fair Value
Unvested at January 1, 2018		371,557		$	31.96
Granted		179,774			29.47
Vested		—			—
Forfeited		(11,060	)		30.44
Unvested at September 30, 2018		540,271		$	31.16

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)	20.0% - 24.0%
Dividend yield(2)		—
Risk-free rate	2.4% - 2.7%
Expected term	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.