Performance goals met in percentile based on relative index.

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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 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 noncash expense for 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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Percentage of vesting of award under share-based payment arrangement.

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Incentive Compensation - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 17, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 4,241,000	$ 5,083,000	$ 9,638,000	$ 12,685,000
Equity Incentive Plan [Member] \| Full Value Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant		6,975,375		6,975,375
2016 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
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
Fair value granted				$ 10,520,000
Unrecognized compensation cost		$ 567,000		$ 567,000
Unrecognized compensation cost expected to be recognized over a weighted-average period				6 months
2016 Performance Program [Member] \| Scenario Forecast [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining units nonvested							108,009
2019 Performance Program [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance measurement period, term	3 years
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%
Fair value of awards granted	$ 7,488,250
Vesting period	4 years
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%