Noncontrolling Interest Represented by Preferred Operating Partnership Units (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended		2 Months Ended	3 Months Ended	9 Months Ended
	Aug. 17, 2020	Apr. 25, 2019	Dec. 01, 2018	Apr. 18, 2017	Dec. 31, 2014	Oct. 31, 2014	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2007	Jun. 25, 2007
Noncontrolling Interest [Line Items]
Loans and notes to affiliates								$ 100,000	$ 100,000		$ 100,000
Units converted, cash paid									$ 1,000	$ 0
Loan to affiliates					$ 20,230
Note receivable interest rate									5.00%
Proceeds from repayment of loan receivable								$ 8,226	$ 8,226	$ 0
Series A Units
Noncontrolling Interest [Line Items]
Fixed priority return on preferred OP units, amount						$ 101,700
Fixed priority return on preferred OP units, stated return rate				2.30%
Fixed priority return on preferred OP units, liquidation value						$ 101,700						$ 115,000
Preferred units outstanding (in shares)						875,480
Series B Units
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share)								$ 25.00	$ 25.00
Preferred units outstanding (in shares)								1,636,087	1,636,087
Fixed liquidation value								$ 40,902	$ 40,902
Annual rate of return percentage									6.00%
Units converted (shares)	40,000
Units converted, cash paid									$ 1,000
Series C Units
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share)								$ 42.10	$ 42.10
Period from date of issuance after which preferred OP units will become redeemable at the option of the holder									1 year
Preferred OP units conversion ratio									0.9145
Shares converted (in shares)		296,020	407,996
Series D Units
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share)								$ 25.00	$ 25.00
Preferred units outstanding (in shares)								4,694,485	4,694,485
Fixed liquidation value								$ 117,362	$ 117,362
Shares converted (in shares)							108,960
Number of units issued (in shares)										1,120,924
Value of units issued										$ 28,022
Series D Units | Minimum
Noncontrolling Interest [Line Items]
Annual rate of return percentage									3.00%
Series D Units | Maximum
Noncontrolling Interest [Line Items]
Annual rate of return percentage									5.00%
Operating Partnership Holders of A Units | Series A Units
Noncontrolling Interest [Line Items]
Loans and notes to affiliates													$ 100,000
Maximum number of preferred OP units converted prior to the maturity date of the loan (in shares)						114,500
Note receivable interest rate				2.10%
Noncontrolling Interest - Operating Partnership
Noncontrolling Interest [Line Items]
Issuance of units upon conversion (in shares)		270,709	373,113				30,495
Loan receivable, reduction of noncontrolling interests								$ 10,297	$ 10,297		$ 18,524