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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Unrecognized Compensation Expense Total unrecognized compensation expense will be adjusted for forfeitures and the achievement of certain market-based conditions.
Unrecognized
Compensation Expense Related to Outstanding Awards
(in thousands)		Remaining Weighted-
Average Amortization
Period
(in years)
RSUs with service vesting conditions$10,180  1.6
RSUs with market vesting conditions1,878  1.7
Total unrecognized compensation expense$12,058  
Summary of Restricted Stock Award and Restricted Stock Unit Activity
RSU activity during the years ended December 31, 2019, 2018 and 2017, was as follows:
   Performance-Based Awards
 Service-Based AwardsPerformance VestingMarket Vesting
 Number of
RSUs
(in thousands)
Weighted-
Average Grant-
Date Fair
Value(1)
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, 2017892  $16.93  119  $14.07  972  $9.01  
Granted272  $17.51  192  $17.45  104  $18.58  
Settled(417) $17.75  (119) $14.07  —  $—  
Forfeited(145) $15.13  (39) $17.45  (865) $8.35  
Outstanding at December 31, 2017602  $17.06  153  $17.45  211  $16.46  
Granted401  $19.42  57  $19.52  204  $17.41  
Settled(399) $17.46  (153) $17.45  (41) $20.76  
Forfeited(81) $18.05  (25) $19.52  (77) $15.36  
Outstanding at December 31, 2018523  $18.42  32  $19.52  297  $16.79  
Granted687  $16.02  24  $17.20  247  $15.35  
Settled(249) $18.03  (33) $19.46  (53) $12.36  
Forfeited(33) $17.86  (23) $17.20  (236) $16.52  
Outstanding at December 31, 2019928  $16.77  —  $—  255  $16.56  
Vested at December 31, 201938  $15.52  —  $—  45  $18.58  
Nonvested at December 31, 2019890  $16.82  —  $—  210  $16.11  
Vested at December 31, 20187  $19.11  32  $19.52  50  $12.03  
Nonvested at December 31, 2018516  $18.41  —  $—  247  $17.75  
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(1)An independent valuation was performed contemporaneously with the issuance of grants.
Summary of Key Assumptions Used for Fair Value Computation During the year ended December 31, 2019, the grant-date fair value of awards with market vesting conditions were calculated using a Monte Carlo simulation model with the following key assumptions:
Expected holding period2.90 years
Risk–free rate of return2.46 %
Expected dividend yield5.12 %