Related Party Transactions and Arrangements - Amount Contractually Due and Forgiven (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Payable to related party	$ 14,038		$ 4,789
Affiliated Entity
Related Party Transaction [Line Items]
Total expenses from transactions with related party	8,748	$ 8,120
Payable to related party	14,038		4,789
Affiliated Entity | Acquisition expenses | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party	142	248
Payable to related party	1		225
Affiliated Entity | Administrative services expenses | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party	4,112	3,963
Payable to related party	4,392		1,238
Affiliated Entity | Asset management and subordinated performance fee | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party	3,912	3,644
Payable to related party	5,901		3,326
Affiliated Entity | Other related party expenses | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party	582	265
Payable to related party	3,744		$ 0
Affiliated Entity | Acquisition fees and expenses, including amount capitalized | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party	2,100	1,800
Affiliated Entity | Acquisition fees and expenses, amount capitalized | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party	2,000	1,500
Third Party Vendor | Affiliated Entity | Other related party expenses | Nonrecurring Fees
Related Party Transaction [Line Items]
Total expenses from transactions with related party		$ 700
Payable to related party	$ 2,500