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Loans Receivable and Other Lending Investments, net - Other Lending Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-Sale Securities
Amortized Cost Basis	$ 20,680
Estimated Fair Value	23,640
Held-to-Maturity Securities
Total	86,368
Estimated Fair Value	86,368
Total Other Lending Investments
Face Value	120,680	$ 121,140
Amortized Cost Basis	107,048	106,121
Net Unrealized Gain	2,960	2,756
Estimated Fair Value	110,008	108,877
Net Carrying Value	110,008	108,877
Municipal debt securities
Available-for-Sale Securities
Face Value	20,680	21,140
Amortized Cost Basis	20,680	21,140
Net Unrealized Gain	2,960	2,756
Estimated Fair Value	23,640	23,896
Net Carrying Value	23,640	23,896
Debt securities
Held-to-Maturity Securities
Face Value	100,000	100,000
Total	86,368	84,981
Net Unrealized Gain	0	0
Estimated Fair Value	86,368	84,981
Net Carrying Value	$ 86,368	$ 84,981

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