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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |  |
Total Unvested Units |  |  |  |
Unvested at beginning of year (in shares) | 159,401 | 132,603 | 114,877 | 91,058
Granted (in shares) | 50,349 | 45,196 | 41,643 |
Vested (in shares) | (22,387) | (15,116) | (13,222) |
Forfeited and canceled (in shares) | (1,164) | (12,354) | (4,602) |
Unvested at end of year (in shares) | 159,401 | 132,603 | 114,877 | 91,058
Weighted- average grant price |  |  |  |
Unvested at beginning of year (in dollars per share) | $ 214.34 | $ 197.62 | $ 180.99 |
Granted (in dollars per share) | 337.52 | 248.16 | 235.93 |
Vested (in dollars per share) | 229.90 | 170.61 | 143.56 |
Forfeited and canceled (in dollars per share) | 219.30 | 184.11 | 158.06 |
Unvested at end of year (in dollars per share) | $ 251.03 | $ 214.34 | $ 197.62 | $ 180.99
Long Term Incentive Plans - Z Units and 2014 LTIP Units |  |  |  |
Total Unvested Units |  |  |  |
Unvested at beginning of year (in shares) | 0 | 0 | 1,890 | 11,161
Granted (in shares) | 0 | 0 | 0 |
Vested (in shares) | 0 | (1,890) | (9,176) |
Converted (in shares) | 0 | 0 | 0 |
Forfeited and canceled (in shares) | 0 | 0 | (95) |
Unvested at end of year (in shares) | 0 | 0 | 1,890 | 11,161
Weighted- average grant price |  |  |  |
Unvested at beginning of year (in dollars per share) | $ 84.47 | $ 75.03 | $ 75.03 |
Unvested at end of year (in dollars per share) | $ 84.47 | $ 84.47 | $ 75.03 | $ 75.03
Total Vested Units |  |  |  |
Vested, beginning balance (in shares) | 106,137 | 143,257 | 134,081 |
Vested, units granted (in shares) | 0 | 0 | 0 |
Vested, units vested (in shares) | 0 | 1,890 | 9,176 |
Converted (in shares) | 0 | (39,010) | 0 |
Cancelled (in shares) | 0 | 0 | 0 |
Vested, ending balance (in shares) | 106,137 | 106,137 | 143,257 | 134,081
Total Outstanding Units |  |  |  |
Total outstanding units, beginning balance (in shares) | 106,137 | 145,147 | 145,242 |
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 | (39,010) | 0 |
Total outstanding units, cancelled (in shares) | 0 | 0 | (95) |
Total outstanding units, ending balance (in shares) | 106,137 | 106,137 | 145,147 | 145,242
Weighted- average Remaining Contractual Life (years) | 2 years 7 months 6 days | 3 years 7 months 6 days | 5 years 2 months 12 days | 6 years 6 months

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