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Equity-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Unrecognized Compensation Cost
Total unrecognized compensation expense will be adjusted for actual forfeitures.
 
Unrecognized Compensation Expense Related to Outstanding Awards (in thousands)
 
Remaining Weighted-Average Amortization Period (in years)
RSUs with service vesting conditions
$
7,039

 
1.9
RSUs with performance vesting conditions
182

 
0.3
RSUs with market vesting conditions
3,198

 
2.0
Total unrecognized compensation expense
$
10,419

 
 
Summary of Restricted Stock Award and Restricted Stock Unit Activity
RSU activity during the nine months ended September 30, 2018, was as follows:
 
 
 
 
 
Performance-Based Awards
 
Service-Based Awards
 
Performance Vesting
 
Market Vesting
 
Number of
RSUs
(in thousands)
 
Weighted-
Average Grant-
Date Fair
Value
 
Number of
RSUs
(in thousands)
 
Weighted-
Average Grant-
Date Fair
Value
 
Number of
RSUs
(in thousands)
 
Weighted-
Average Grant-
Date Fair
Value(1)
Outstanding at January 1, 2018
602

 
$
17.06

 
153

 
$
17.45

 
211

 
$
16.46

Granted
392

 
$
19.44

 
56

 
$
19.52

 
204

 
$
17.41

Settled
(399
)
 
$
17.46

 
(153
)
 
$
17.45

 
(41
)
 
$
20.76

Forfeited
(57
)
 
$
18.15

 
(8
)
 
$
19.52

 
(47
)
 
$
16.19

Outstanding at September 30, 2018
538

 
$
18.39

 
48

 
$
19.52

 
327

 
$
16.54

 
 
 
 
 
 
 
 
 
 
 
 
Vested at September 30, 2018
2

 
$
21.66

 
—

 
$
—

 
—

 
$
—

Nonvested at September 30, 2018
536

 
$
18.38

 
48

 
$
19.52

 
327

 
$
16.54

_________________________________
(1)
An independent third-party valuation is performed contemporaneously with the issuance of grants.
Summary of Key Assumptions Used for Fair Value Computation
During the nine months ended September 30, 2018, the grant-date fair value of awards with market vesting conditions was calculated using a Monte Carlo simulation model with the following key assumptions:
Expected holding period
2.86 years

Risk-free rate of return
2.37
%
Expected dividend yield
4.61
%