Equity Based Compensation Plans - Restricted Stock Activity and LITP Units (Details) - $ / shares	12 Months Ended
	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