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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, by Award
Stock-based compensation expense recorded for each type of stock-based compensation award for the years ended December 31, 2019, 2018 and 2017 is as follows (in thousands):
 
 
Year ended December 31,
 
 
2019
 
2018
 
2017
Time-based restricted stock(1)
 
$
4,256

 
$
7,200

 
$
5,492

Time-based restricted stock units(1)
 
9,395

 
5,690

 
7,778

Performance-based restricted stock(2)
 
4,332

 
6,987

 
6,349

Performance-based restricted stock units
 
2,699

 
—

 
—

Total stock-based compensation
 
$
20,682

 
$
19,877

 
$
19,619

 
 
 
(1)
Stock-based compensation expense relating to RSAs and RSUs with ratable vesting is recognized on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards.
(2)
Includes stock-based compensation expense related to historical PSUs prior to the conversion of such awards to PSAs.
Summary of RSA, Activity RSA activity for the year ended December 31, 2019:
 
 
Time-Based Restricted Stock
 
Grant Date Fair Value
Outstanding at January 1, 2019
 
715,852

 
$
23.44

Forfeited
 
(19,763
)
 
$
25.55

Vested
 
(309,699
)
 
$
19.32

Outstanding at December 31, 2019
 
386,390

 
$
26.64
Schedule of Nonvested Restricted Stock Units Activity The following table summarizes the RSU activity for the year ended December 31, 2019:
 
 
Time-Based Restricted Stock Units
 
Grant Date Fair Value
Outstanding at January 1, 2019
 
723,354

 
$
23.78

Awards granted
 
992,825

 
$
17.83

Forfeited
 
(174,643
)
 
$
20.82

Vested
 
(301,078
)
 
$
19.43

Outstanding at December 31, 2019
 
1,240,458

 
$
20.48
Schedule of Valuation Assumptions The Company used the following assumptions to estimate the fair value of PSUs and PSAs granted during the periods indicated:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Risk-free interest rate
 
2.46
%
 
2.25
%
 
1.45
%
Range of volatilities
 
32.4% - 61.8%

 
34.4% - 82.2%

 
37.7% - 79.5%
Schedule of PSU, Activity
The following table summarizes the PSU activity for the year ended December 31, 2019:
 
 
Performance-Based Restricted Stock Units
 
Grant Date Fair Value
Outstanding at January 1, 2019
 
—

 
$
—

Awards granted
 
376,166

 
$
24.05

Vested
 
(2,455
)
 
$
24.05

Forfeited
 
(15,471
)
 
$
24.05

Outstanding at December 31, 2019
 
358,240

 
$
24.05


The following table summarizes the PSA activity for the year ended December 31, 2019:
 
 
Performance-Based Restricted Stock
 
Grant Date Fair Value
Outstanding at January 1, 2019
 
1,338,439

 
$
15.07

Vested
 
(481,820
)
 
$
13.07

Forfeited
 
(66,112
)
 
$
15.74

Outstanding at December 31, 2019
 
790,507

 
$
16.24
Schedule of Expected Share Based Compensation Expense
The following table reflects the future stock-based compensation expense to be recorded for the stock-based compensation awards that were outstanding at December 31, 2019 (in thousands):
 
 
Time-Based Restricted Stock
 
Time-Based Restricted Stock Units
 
Performance-Based Restricted Stock
 
Performance-Based Restricted Stock Units
 
Total
2020
 
$
1,933

 
$
7,324

 
$
2,111

 
$
2,992

 
$
14,360

2021
 
193

 
4,455

 
—

 
2,984

 
7,632

2022
 
—

 
458

 
—

 
—

 
458

Total
 
$
2,126

 
$
12,237

 
$
2,111

 
$
5,976

 
$
22,450