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Loans Receivable and Other Lending Investments, net - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with allowance recorded, Recorded Investment	$ 38,400		$ 38,400		$ 66,725
Impaired loans with allowance recorded, Unpaid Principal Balance	38,501		38,501		66,777
Impaired loans with allowance recorded, Related Allowance	(21,701)		(21,701)		(40,395)
Impaired loans with no related allowance recorded, Average Recorded Investment	0	$ 0	0	$ 0
Impaired loans with no related allowance recorded, Interest Income Recognized	0	209	0	301
Impaired loans with allowance recorded, Average Recorded Investment	38,572	67,001	39,074	148,998
Impaired loans with allowance recorded, Interest Income Recognized	0	0	0	0
Impaired loans, Average Recorded Investment	38,572	67,001	39,074	148,998
Impaired loans, Interest Income Recognized	0	209	0	301
Senior mortgages
Financing Receivable, Impaired [Line Items]
Impaired loans with allowance recorded, Recorded Investment	38,400		38,400		66,725
Impaired loans with allowance recorded, Unpaid Principal Balance	38,501		38,501		66,777
Impaired loans with allowance recorded, Related Allowance	(21,701)		(21,701)		$ (40,395)
Impaired loans with allowance recorded, Average Recorded Investment	38,572	67,001	39,074	70,696
Impaired loans with allowance recorded, Interest Income Recognized	0	0	0	0
Impaired loans, Average Recorded Investment	38,572	67,001	39,074	70,696
Impaired loans, Interest Income Recognized	0	0	0	0
Corporate/Partnership loans
Financing Receivable, Impaired [Line Items]
Impaired loans with allowance recorded, Average Recorded Investment	0	0	0	78,302
Impaired loans with allowance recorded, Interest Income Recognized	0	0	0	0
Impaired loans, Average Recorded Investment	0	0	0	78,302
Impaired loans, Interest Income Recognized	0	0	0	0
Subordinate mortgages
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance recorded, Average Recorded Investment	0	0	0	0
Impaired loans with no related allowance recorded, Interest Income Recognized	0	209	0	301
Impaired loans, Average Recorded Investment	0	0	0	0
Impaired loans, Interest Income Recognized	$ 0	$ 209	$ 0	$ 301

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- Definition

The interest income recognized on a cash-basis or accrual method of accounting during the time within that period that the financing receivables were impaired.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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