Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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 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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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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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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The amortization period for amortizing the expense under the out performance plan.

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The fair value at grant date for equity-based awards issued 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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Threshold Percentage to Satisfy Performance Based Condition

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Threshold Period to Satisfy Performance Based Condition

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Stock-based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 31,654	$ 13,669
Performance Conditioned AO LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold percentage to satisfy performance based condition (percent)				110.00%
Weighted average grant date fair value (in usd per share)				$ 64.48
Threshold period to satisfy performance based condition (in days)				20 days
Stock options expiration term (years)				10 years
Grant-Date Fair Value				$ 8,983
Share-based compensation expense				7,481
Amortized share based compensation				$ 1,502
Amortization period (years)				4 years
Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ (2,578)	$ (2,578)	$ (2,578)			$ (8,477)
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 16,211