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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restricted Stock |  |  |  |
Total Unvested Units |  |  |  |
Unvested at beginning of year (in shares) | 114,877 | 91,058 | 90,823 | 58,349
Granted (in shares) | 41,643 | 51,945 | 62,706 |
Vested (in shares) | (13,222) | (48,212) | (29,675) |
Forfeited and canceled (in shares) | (4,602) | (3,498) | (557) |
Unvested at end of year (in shares) | 114,877 | 91,058 | 90,823 | 58,349
Weighted- average grant price |  |  |  |
Unvested at beginning of year (in dollars per share) | $ 180.99 | $ 163.49 | $ 149.11 |
Granted (in dollars per share) | 235.93 | 194.70 | 177.28 |
Vested (in dollars per share) | 143.56 | 150.76 | 170.17 |
Forfeited and canceled (in dollars per share) | 158.06 | 158.71 | 119.37 |
Unvested at end of year (in dollars per share) | $ 197.62 | $ 180.99 | $ 163.49 | $ 149.11
Long Term Incentive Plans - Z Units and 2014 LTIP Units |  |  |  |
Total Unvested Units |  |  |  |
Unvested at beginning of year (in shares) | 1,890 | 11,161 | 23,212 | 60,027
Granted (in shares) | 0 | 0 | 0 |
Vested (in shares) | (9,176) | (12,051) | (32,961) |
Converted (in shares) | 0 | 0 | 0 |
Forfeited and canceled (in shares) | (95) | 0 | (3,854) |
Unvested at end of year (in shares) | 1,890 | 11,161 | 23,212 | 60,027
Weighted- average grant price |  |  |  |
Unvested at beginning of year (in dollars per share) | $ 75.03 | $ 75.03 | $ 75.11 |
Unvested at end of year (in dollars per share) | $ 75.03 | $ 75.03 | $ 75.03 | $ 75.11
Total Vested Units |  |  |  |
Vested, beginning balance (in shares) | 134,081 | 213,300 | 181,027 |
Vested, units granted (in shares) | 0 | 0 | 0 |
Vested, units vested (in shares) | 9,176 | 12,051 | 32,961 |
Converted (in shares) | 0 | (91,270) | (688) |
Cancelled (in shares) | 0 | 0 | 0 |
Vested, ending balance (in shares) | 143,257 | 134,081 | 213,300 | 181,027
Total Outstanding Units |  |  |  |
Total outstanding units, beginning balance (in shares) | 145,242 | 236,512 | 241,054 |
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 | (91,270) | (688) |
Total outstanding units, cancelled (in shares) | (95) | 0 | (3,854) |
Total outstanding units, ending balance (in shares) | 145,147 | 145,242 | 236,512 | 241,054
Weighted- average Remaining Contractual Life (years) | 5 years 2 months 12 days | 6 years 6 months | 7 years 6 months | 8 years 6 months

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