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Equity Based Compensation Plans - Restricted Stock Activity and LITP Units (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock |  |  |  |
Total Unvested Units |  |  |  |
Unvested at beginning of year (in shares) | 182,915 | 159,401 | 132,603 | 114,877
Granted (in shares) | 72,838 | 50,349 | 45,196 |
Vested (in shares) | (44,945) | (22,387) | (15,116) |
Forfeited and canceled (in shares) | (4,379) | (1,164) | (12,354) |
Unvested at end of year (in shares) | 182,915 | 159,401 | 132,603 | 114,877
Weighted- average grant price |  |  |  |
Unvested at beginning of year (in dollars per share) | $ 251.03 | $ 214.34 | $ 197.62 |
Granted (in dollars per share) | 215.73 | 337.52 | 248.16 |
Vested (in dollars per share) | 306.25 | 229.90 | 170.61 |
Forfeited and canceled (in dollars per share) | 272.12 | 219.30 | 184.11 |
Unvested at end of year (in dollars per share) | $ 222.90 | $ 251.03 | $ 214.34 | $ 197.62
Long Term Incentive Plans - Z Units and 2014 LTIP Units |  |  |  |
Total Unvested Units |  |  |  |
Unvested at beginning of year (in shares) | 0 | 0 | 0 | 1,890
Granted (in shares) | 0 | 0 | 0 |
Vested (in shares) | 0 | 0 | (1,890) |
Converted (in shares) | 0 | 0 | 0 |
Forfeited and canceled (in shares) | 0 | 0 | 0 |
Unvested at end of year (in shares) | 0 | 0 | 0 | 1,890
Weighted- average grant price |  |  |  |
Unvested at beginning of year (in dollars per share) | $ 84.47 | $ 84.47 | $ 75.03 |
Unvested at end of year (in dollars per share) | $ 84.47 | $ 84.47 | $ 84.47 | $ 75.03
Total Vested Units |  |  |  |
Vested, beginning balance (in shares) | 106,137 | 106,137 | 143,257 |
Vested, units granted (in shares) | 0 | 0 | 0 |
Vested, units vested (in shares) | 0 | 0 | 1,890 |
Converted (in shares) | 0 | 0 | (39,010) |
Cancelled (in shares) | 0 | 0 | 0 |
Vested, ending balance (in shares) | 106,137 | 106,137 | 106,137 | 143,257
Total Outstanding Units |  |  |  |
Total outstanding units, beginning balance (in shares) | 106,137 | 106,137 | 145,147 |
Total outstanding units, granted (in shares) | 0 | 0 | 0 |
Total outstanding units, vested (in shares) | 0 | 0 | 0 |
Total outstanding units, converted (in shares) | 0 | 0 | (39,010) |
Total outstanding units, cancelled (in shares) | 0 | 0 | 0 |
Total outstanding units, ending balance (in shares) | 106,137 | 106,137 | 106,137 | 145,147
Weighted- average Remaining Contractual Life (years) | 1 year 7 months 6 days | 2 years 7 months 6 days | 3 years 7 months 6 days | 5 years 2 months 12 days

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