Partners' Capital, Equity and Incentive Compensation Plans (Summary of Award Activity Under 2010 Equity Incentive Plan and 2013 Equity Incentive Plan and Related Information) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance-Based Relative TSR Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, Granted (in shares)	86,089
Number of units, Cancelled/Expired (in shares)	(1,739)
Ending balance, Number of units (in shares)	84,350
Weighted average fair value, granted, options	$ 54.64
Weighted average fair value, cancelled/expired, options	54.64
Ending balance, weighted average fair value, options	$ 54.64
Performance-Based FFO Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, Granted (in shares)	86,089
Number of units, Cancelled/Expired (in shares)	(1,739)
Ending balance, Number of units (in shares)	84,350
Weighted average fair value, granted, options	$ 42.01
Weighted average fair value, cancelled/expired, options	42.01
Ending balance, weighted average fair value, options	$ 42.01
2013 Equity Incentive Plan | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Options Outstanding (in shares)	2,037,163	1,369,270	1,058,297
Options, Granted (in shares)	135,594	674,081	468,875
Options, Exercised (in shares)	(125,213)	(6,188)	(155,902)
Options, Cancelled/Expired (in shares)	(112,706)		(2,000)
Ending balance, Options Outstanding (in shares)	1,934,838	2,037,163	1,369,270
Beginning balance, Weighted average exercise price options outstanding	$ 36.86	$ 38.18	$ 31.72
Weighted average exercise price options outstanding, Granted	42.27	34.05	50.66
Weighted average exercise price options outstanding, Exercised	30.80	21.50	31.89
Weighted average exercise price options outstanding, Cancelled/Expired	45.86		37.69
Ending balance, Weighted average exercise price options outstanding	37.11	36.86	38.18
Beginning balance, weighted average fair value, options	7.10	7.80	6.51
Weighted average fair value, granted, options	7.62	5.63	10.32
Weighted average fair value, vested, options	6.21	3.68	6.60
Weighted average fair value, cancelled/expired, options	9.43		8.77
Ending balance, weighted average fair value, options	$ 7.05	$ 7.10	$ 7.80
2013 Equity Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of units (in shares)	420,309	381,864	414,691
Number of units, Granted (in shares)	274,564	348,152	228,576
Number of units, Exercised	(279,429)	(224,660)	(163,048)
Number of units, Cancelled/Expired (in shares)	(25,694)	(85,047)	(98,355)
Ending balance, Number of units (in shares)	389,750	420,309	381,864
Beginning balance, Weighted average exercise price units	$ 37.83	$ 46.37	$ 40.67
Weighted average exercise price units, Granted	42.25	35.27	49.86
Weighted average exercise price units, Exercised	39.20	46.23	40.63
Weighted average exercise price units, Cancelled/Expired	42.17	43.50	39.97
Ending balance, Weighted average exercise price units	$ 39.67	$ 37.83	$ 46.37
Class O Units | 2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of units (in shares)	102,279	568,040	1,134,811
Number of units, Exercised	(19,969)	(465,761)	(566,771)
Ending balance, Number of units (in shares)	82,310	102,279	568,040
Beginning balance, Weighted average exercise price units	$ 24.05	$ 23.52	$ 24.06
Weighted average exercise price units, Exercised	20.25	23.40	24.60
Ending balance, Weighted average exercise price units	24.97	24.05	23.52
Beginning balance, Weighted average fair value	5.67	5.00	3.62
Weighted average fair value, Exercised	4.42	4.76	2.24
Ending balance, Weighted average fair value	$ 5.97	$ 5.67	$ 5.00