Notes and Other Receivables (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 216,541	$ 71,895
Secured Note Receivable, 10.00% Interest Rate, Due May 2021 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 16,418	15,226
Stated interest rate	10.00%
Secured Note Receivable, 10.75% Interest Rate, Due September 2020 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 35,384	32,650
Stated interest rate	10.75%
Secured Note Receivable, 9.90% Interest Rate, Due October 2019 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 7,324	0
Stated interest rate	9.90%
Related Party Bridge Loans, Secured, Due October 2019 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 6,618	6,618
Interest rate	9.50%
Related Party Bridge Loans on Property Acquired By Wesco V [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 89,221	0
Related Party Bridge Loan on Property Acquired By BEX IV [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 44,462	0
Interest rate	3.25%
Notes and Other Receivables from Affiliates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 4,311	4,457
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 12,803	$ 12,944