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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of the unvested restricted shares | A summary of the unvested restricted shares is as follows:
| 2021 |  | 2020 |  | 2019
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Unvested at January 1, | 1,252,228 |  |  | $ | 15.17 |  |  | 940,202 |  |  | $ | 20.21 |  |  | 740,792 |  |  | $ | 21.89 |
Granted | 1,739,327 |  |  | 15.92 |  |  | 801,463 |  |  | 11.95 |  |  | 530,436 |  |  | 18.69 |
Vested | (513,342) |  |  | 16.51 |  |  | (480,444) |  |  | 19.59 |  |  | (312,131) |  |  | 21.63 |
Forfeited | (97,930) |  |  | 15.22 |  |  | (8,993) |  |  | 18.80 |  |  | (18,895) |  |  | 20.03 |
Unvested at December 31, | 2,380,283 |  |  | $ | 15.43 |  |  | 1,252,228 |  |  | $ | 15.17 |  |  | 940,202 |  |  | $ | 20.21 |
Share-based Compensation Arrangements by Share-based Payment Award, Performance-Based Units, Vested and Expected to Vest | A summary of the performance unit awards is as follows:
Date of Award |  | Number of Units Granted |  | Grant Date Fair Value |  | Conversion Range |  | Risk Free Interest Rate |  | Volatility
February 2018 (1) |  | 264,000 |  | $13.99 |  | 0% to 150% |  | 2.42% |  | 27.44%
February 2019 |  | 260,000 |  | $19.16 |  | 0% to 200% |  | 2.52% |  | 27.19%
February 2020 |  | 489,000 |  | $11.59 |  | 0% to 200% |  | 1.08% |  | 23.46%
February 2021 |  | 431,151 |  | $20.90 |  | 0% to 200% |  | 0.23% |  | 69.47%
(1) In February 2021, following the end of the measurement period, the Company met certain threshold criterion and the performance units were converted into approximately 26,000 restricted shares.

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards 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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