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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 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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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	Mar. 18, 2019	Jan. 14, 2019	Jan. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020	Nov. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of stock options granted							$ 4.02
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 4 months 24 days
Performance measurement period, term					3 years
Fair value of awards granted					$ 8,106,000	$ 7,009,000	$ 10,520,000
Unrecognized compensation cost					$ 9,504,000
Units, Granted					1,356,630
Remaining units nonvested					3,595,834	3,373,570
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					4 years
Fair value granted					$ 1,238,000	$ 1,335,000	1,309,000
Unrecognized compensation cost expected to be recognized over a weighted-average period					2 years 3 months 18 days
Unrecognized compensation cost					$ 1,823,000
Units, Granted					93,308
Vested units					63,821
Remaining units nonvested					168,470	162,981
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					8,358,300
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					$ 13,091,000	$ 10,145,000	$ 7,467,000
Unrecognized compensation cost					$ 12,854,000
Unrecognized compensation cost expected to be recognized over a weighted-average period					2 years 7 months 6 days
Units, Granted					1,067,854
Vested units					752,645
Remaining units nonvested					1,571,464	1,284,083
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
2015 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value granted		$ 10,914,000
Unrecognized compensation cost		$ 187,000
Performance measurement period, units forfeited		1,109,358
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					1 year
Unrecognized compensation cost					$ 1,135,000
Performance goals met in percentile based on relative index					30th percentile
Units, Granted				1,085,244
Earned Units				216,005
2016 Performance Program [Member] \| Scenario Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining units nonvested								108,009
2016 Performance Program [Member] \| Subsequent Event [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested units	107,996
2018 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			$ 8,106,000
Performance measurement period, start date			Jan. 01, 2019
Performance measurement period, end date			Dec. 31, 2021
2018 Performance Program [Member] \| Share-Based Compensation Award Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of the awards that vest			50.00%
2018 Performance Program [Member] \| Share-Based Compensation Award Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of the awards that vest			50.00%