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Long-Term Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Performance Award Valuation Assumptions | The fair values were determined by a lattice-binomial option-pricing model based on Monte Carlo simulations using the following assumptions:
| Year Ended December 31, 2021 |  | Year Ended December 31, 2020 |  | Year Ended December 31, 2019
Expected dividend yield | 2.49 | % |  | 2.22 | % |  | 3.02 | %
Expected volatility - range used | 29.00% - 37.18% |  | 16.25% - 17.56% |  | 18.53% - 19.72%
Expected volatility - weighted average | 32.44 | % |  | 16.97 | % |  | 19.10 | %
Risk-free interest rate | 0.02% - 0.19% |  | 1.63% - 1.68% |  | 2.45% - 2.57%
Summary of Performance Award Transactions | Performance Award transactions for the year ended December 31, 2021 are summarized as follows:
| Performance Units |  | Weighted Average Grant Date Fair Value |  | Performance RLP Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020 | 256,093 |  |  | $ | 14.86 |  |  | 479,179 |  |  | $ | 17.97 |
Issued | 58,568 |  |  | $ | 22.23 |  |  | 263,621 |  |  | $ | 22.23 |
Forfeited | (8,118) |  |  | $ | 18.96 |  |  | (11,362) |  |  | $ | 20.65 |
Vested | (164,045) |  |  | $ | 13.28 |  |  | (7,013) |  |  | $ | 20.65 |
Outstanding at December 31, 2021 | 142,498 |  |  | $ | 19.47 |  |  | 724,425 |  |  | $ | 19.45 |
Summary of Service Award Transactions | Service Award transactions for the year ended December 31, 2021 are summarized as follows:
| Service Units |  | Weighted Average Grant Date Fair Value |  | Service RLP Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020 | 211,920 |  |  | $ | 36.35 |  |  | 184,569 |  |  | $ | 39.62 |
Issued | 67,127 |  |  | $ | 43.64 |  |  | 51,525 |  |  | $ | 43.96 |
Forfeited | (2,508) |  |  | $ | 41.59 |  |  | — |  |  | $ | — |
Vested | (128,602) |  |  | $ | 33.60 |  |  | (77,925) |  |  | $ | 38.49 |
Outstanding at December 31, 2021 | 147,937 |  |  | $ | 41.95 |  |  | 158,169 |  |  | $ | 41.60 |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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