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	3 Months Ended
	Nov. 30, 2018	Mar. 31, 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
Ending balance, Options Outstanding (in shares)		86,089
Weighted average fair value, granted, 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
Ending balance, Options Outstanding (in shares)		86,089
Weighted average fair value, granted, 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)		124,955
Options, Exercised (in shares)		(96,589)
Options, Cancelled/Expired (in shares)		(60,285)
Ending balance, Options Outstanding (in shares)		2,005,244
Beginning balance, Weighted average exercise price options outstanding		$ 36.86
Weighted average exercise price options outstanding, Granted		42.01
Weighted average exercise price options outstanding, Exercised		27.82
Weighted average exercise price options outstanding, Cancelled/Expired		46.07
Ending balance, Weighted average exercise price options outstanding		37.34
Beginning balance, weighted average fair value, options		7.10
Weighted average fair value, granted, options		7.56
Weighted average fair value, vested, options		5.58
Weighted average fair value, cancelled/expired, options		9.62
Ending balance, weighted average fair value, options		$ 7.12
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)		265,231
Options, Exercised (in shares)		(95,330)
Options, Cancelled/Expired (in shares)		(54,041)
Ending balance, Options Outstanding (in shares)		536,169
Beginning balance, weighted average fair value, options		$ 37.83
Weighted average fair value, granted, options		42.01
Weighted average fair value, vested, options		37.12
Weighted average fair value, cancelled/expired, options		38.73
Ending balance, weighted average fair value, options		$ 39.93
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
Ending balance, Number of units (in shares)		102,279
Beginning balance, Weighted average exercise price units		$ 24.05
Ending balance, Weighted average exercise price units		24.05
Beginning balance, Weighted average fair value		5.67
Ending balance, Weighted average fair value		$ 5.67