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Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units, Roll Forward
All share-based compensation awards, regardless of the form of payout upon vesting, are presented in the following table, which summarizes our stock-based award activity. For performance-based awards, the number of shares deemed to be issued per the table below reflects the number of units at target performance. Performance-based awards contain terms which dictate that the number of award units to be issued will vary based upon actual performance compared to the respective plan’s performance metrics, with the potential for certain awards to earn additional shares beyond target performance (number of units in thousands):
 
Nine Months Ended
 
September 30, 2019
 
Restricted
Stock Awards(1)
 
Performance
Stock Awards(1)
 
Phantom
Stock Units
 
Weighted-Average Grant-Date Fair Value(2)
Nonvested at December 31, 2018
808

 
199

 
998

 
$
10.60

Granted
470

 
2,293

 
—

 
11.05

Vested
(196
)
 
—

 
—

 
10.99

Forfeited
(93
)
 
(7
)
 
(43
)
 
10.77

Nonvested at September 30, 2019
989

 
2,485

 
955

 
$
10.86

(1) 
The maximum number of award units that could be issued under all outstanding grants, excluding phantom stock units as they are settled in cash, was 3.9 million as of September 30, 2019. The number of award units expected to vest, excluding phantom units as they are settled in cash, was 2.3 million as of September 30, 2019.
(2) 
On an annual basis, we engage an independent third-party valuation advisory consulting firm to estimate the EVPS of our common stock.