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Loans Receivable - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
Loans Receivable - Narrative (Details) $ in Thousands	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest receivable		$ 10,171		$ 10,171		$ 6,897
Non-real estate loans		451,968		451,968		362,850
Allowance for credit losses on non-real estate loans receivable		78,133		78,133		25,996
Provision for loan losses	$ 18,690	1,422	$ 0	8,494	$ 18,690
Allowance for credit losses		$ 76,695	68,372	$ 76,695	68,372
Number of real estate loans on non-accrual status \| loan		41		41
Carrying value of nonaccrual status		$ 10,716	$ 2,534	$ 10,716	$ 2,534	$ 2,534	$ 2,567
Non-real estate loans receivable
Financing Receivable, Troubled Debt Restructuring [Line Items]
Non-real estate loans		86,411		86,411
Allowance for credit losses on non-real estate loans receivable		$ 42,376		42,376
Provision for loan losses				6,898
Real estate loan receivable
Financing Receivable, Troubled Debt Restructuring [Line Items]
Provision for loan losses				$ 1,303