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Compensation (Tables) | 9 Months Ended
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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.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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