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SHARE-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Transactions Involving Stock Units and Director Stock Grants | Transactions involving our stock units and director stock grants during the nine months ended September 30, 2021 are summarized below:
| Nine Months Ended September 30, 2021
| (unaudited)
| No. of Stock Units |  | Weighted Average Fair Value
| (in thousands) |  |
Stock and stock units, beginning of period | 854 |  |  | $ | 12.55 |
Changes during the period: |  |  |
Granted | 86 |  |  | $ | 8.12 |
Vested and settled | (87) |  |  | $ | 8.22 |
Forfeited and cancelled | (56) |  |  | $ | 12.48 |
Stock and stock units, end of period | 797 |  |  | $ | 12.56 |
Summary of Transactions Involving Performance Awards | Transactions involving our performance awards during the nine months ended September 30, 2021 are summarized below:
| Nine Months Ended September 30, 2021
| (unaudited)
| Performance Units Subject to Market Conditions |  | Performance Units Not Subject to Market Conditions
| No. of Stock Units 1 |  | Weighted Average Fair Value |  | No. of Stock Units 1 |  | Weighted Average Fair Value
| (in thousands) |  |  |  | (in thousands) |  |
Performance stock units, beginning of period | 553 |  |  | $ | 13.69 |  |  | 273 |  |  | $ | 12.55 |
Changes during the period: |  |  |  |  |  |  |
Granted | 576 |  |  | $ | 6.70 |  |  | 110 |  |  | $ | 11.69 |
Vested and settled | (28) |  |  | $ | 25.24 |  |  | — |  |  | $ | — |
Forfeited and cancelled | (387) |  |  | $ | 14.91 |  |  | (135) |  |  | $ | 16.65 |
Performance stock units, end of period | 714 |  |  | $ | 6.45 |  |  | 248 |  |  | $ | 9.94 |
_________________ 1 Performance units with variable payouts are shown at target level of performance.

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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