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Share and Unit-Based Plans - Nonvested equity awards (Details)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Units
Granted (in shares)	1,581,451
LTIP Units
Units
Balance at beginning of period (in shares)	784,052
Granted (in shares)	1,581,451
Vested (in shares)	(16,467)
Forfeited (in shares)	0
Balance at end of period (in shares)	2,349,036
Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 28.11
Granted (in dollars per share) | $ / shares	10.15
Vested (in dollars per share) | $ / shares	29.86
Forfeited (in dollars per share) | $ / shares	0
Balance at end of period (in dollars per share) | $ / shares	$ 16.01
Phantom Stock Units
Units
Balance at beginning of period (in shares)	4,662
Granted (in shares)	15,556
Vested (in shares)	(11,160)
Forfeited (in shares)	0
Balance at end of period (in shares)	9,058
Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 35.35
Granted (in dollars per share) | $ / shares	11.38
Vested (in dollars per share) | $ / shares	16.75
Forfeited (in dollars per share) | $ / shares	0
Balance at end of period (in dollars per share) | $ / shares	$ 17.10
Stock Units
Units
Balance at beginning of period (in shares)	309,845
Granted (in shares)	165,347
Vested (in shares)	(198,937)
Forfeited (in shares)	(987)
Balance at end of period (in shares)	275,268
Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 21.47
Granted (in dollars per share) | $ / shares	14.55
Vested (in dollars per share) | $ / shares	18.64
Forfeited (in dollars per share) | $ / shares	22.12
Balance at end of period (in dollars per share) | $ / shares	$ 19.35

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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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value at grant date for nonvested 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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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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