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	1 Months Ended	6 Months Ended
	Nov. 30, 2018	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction of price, percentage	20.00%
Performance-Based Relative TSR Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted (in shares)		86,089
Options, Cancelled/Expired (in shares)		(1,739)
Ending balance, Options Outstanding (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]
Options, Granted (in shares)		86,089
Options, Cancelled/Expired (in shares)		(1,739)
Ending balance, Options Outstanding (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
Options, Granted (in shares)		135,594
Options, Exercised (in shares)		(112,027)
Options, Cancelled/Expired (in shares)		(103,690)
Ending balance, Options Outstanding (in shares)		1,957,040
Beginning balance, Weighted average exercise price options outstanding		$ 36.86
Weighted average exercise price options outstanding, Granted		42.27
Weighted average exercise price options outstanding, Exercised		29.96
Weighted average exercise price options outstanding, Cancelled/Expired		45.87
Ending balance, Weighted average exercise price options outstanding		37.15
Beginning balance, weighted average fair value, options		7.10
Weighted average fair value, granted, options		7.62
Weighted average fair value, vested, options		6.07
Weighted average fair value, cancelled/expired, options		9.38
Ending balance, weighted average fair value, options		$ 7.07
2013 Equity Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Options Outstanding (in shares)		420,309
Options, Granted (in shares)		267,903
Options, Exercised (in shares)		(196,842)
Options, Cancelled/Expired (in shares)		(18,622)
Ending balance, Options Outstanding (in shares)		472,748
Beginning balance, weighted average fair value, options		$ 37.83
Weighted average fair value, granted, options		42.05
Weighted average fair value, vested, options		37.96
Weighted average fair value, cancelled/expired, options		42.95
Ending balance, weighted average fair value, options		$ 39.96
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
Number of units, Exercised		(8,375)
Ending balance, Number of units (in shares)		93,904
Beginning balance, Weighted average exercise price units		$ 24.05
Weighted average exercise price units, Exercised		20.60
Ending balance, Weighted average exercise price units		24.36
Beginning balance, Weighted average fair value		5.67
Weighted average fair value, Exercised		5.11
Ending balance, Weighted average fair value		$ 5.72