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Performance measurement period, end date.

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Performance measurement period, start date.

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Reduction in percentage of long term incentive plan units earned if negative in shareholder return.

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Share based compensation arrangement by share based payment award equity instruments other than options earned in period.

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Share based compensation arrangement by share based payment award equity instruments other than options earned percentage in period.

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Share based compensation arrangement by share based payment award equity instruments other than options earned percentage in period.

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Share-based compensation arrangement by share based payment award equity instruments other than options granted in period total fair value.

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Share based compensation arrangement by share based payment award grant date fair value.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Incentive Compensation - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 17, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2014
Performance Programs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Unrecognized compensation cost expected to be recognized over a weighted-average period		2 years 1 month 6 days
Performance measurement period, term		3 years
Fair value of awards granted		$ 7,488,000	$ 8,106,000	$ 7,009,000
Unrecognized compensation cost		$ 8,999,000
Units, Granted		1,068,693
Vested units		216,005
Remaining units nonvested		3,780,792	3,595,834
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Fair value granted		$ 1,209,000	$ 1,238,000	$ 1,335,000
Unrecognized compensation cost expected to be recognized over a weighted-average period		2 years 3 months 18 days
Unrecognized compensation cost		$ 1,696,000
Units, Granted		92,424
Vested units		75,895
Remaining units nonvested		168,708	168,470
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost		$ 60,000
Stock options, granted		0		0
Stock Options Expiration Period		10 years
Employee Stock Option [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		5 years
Employee Stock Option [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		3 years
Equity Incentive Plan [Member] \| Full Value Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant		7,001,002
Equity Incentive Plan [Member] \| Full Value Awards [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant					17,142,857
Equity Incentive Plan [Member] \| Not Full Value Awards [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant					34,285,714
LTIP Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value granted		$ 10,940,000	$ 13,091,000	$ 10,145,000
Unrecognized compensation cost		$ 12,970,000
Unrecognized compensation cost expected to be recognized over a weighted-average period		2 years 7 months 6 days
Units, Granted		931,855
Vested units		778,510
Remaining units nonvested		1,724,809	1,571,464
LTIP Units [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		5 years
LTIP Units [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		3 years
2016 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value granted		$ 10,520,000
Unrecognized compensation cost expected to be recognized over a weighted-average period		4 years
Performance measurement period, term			3 years
Performance goals met in percentile based on relative index			30th percentile
Units, Granted	1,085,244
Earned Units	216,005
Percentage of earned units	19.90%
Vested units	107,996
Remaining units nonvested		108,009
2019 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	4 years
Performance measurement period, term	3 years
Fair value of awards granted	$ 7,488,000
Performance measurement period, start date	Jan. 01, 2020
Performance measurement period, end date	Dec. 31, 2022
Reduction in percentage on number of LTIP units earned if negative TSR	30.00%
2019 Performance Program [Member] \| Share-Based Compensation Award Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of earned units	50.00%
Percentage of the awards that vest	50.00%
2019 Performance Program [Member] \| Share-Based Compensation Award Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of earned units	50.00%
Percentage of the awards that vest	50.00%