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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost Basis | $ 21,140 |
Estimated Fair Value | 23,896 |
Held-to-Maturity Securities, Debt Maturities [Abstract] |  |
Amortized Cost Basis | 84,981 |
Estimated Fair Value | 84,981 |
Investments, Debt and Equity Securities [Abstract] |  |
Face Value | 121,140 | $ 142,051
Amortized Cost Basis | 106,121 | 121,650
Net Unrealized Gain (Loss) | 2,756 | 483
Estimated Fair Value | 108,877 | 122,133
Net Carrying Value | 108,877 | 122,126
Municipal Bonds |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Face Value | 21,140 | 21,185
Amortized Cost Basis | 21,140 | 21,185
Net Unrealized Gain (Loss) | 2,756 | 476
Estimated Fair Value | 23,896 | 21,661
Net Carrying Value | 23,896 | 21,661
Corporate Debt Securities |  |
Held-to-Maturity Securities, Debt Maturities [Abstract] |  |
Face Value | 100,000 | 120,866
Amortized Cost Basis | 84,981 | 100,465
Net Unrealized Gain | 0 | 7
Estimated Fair Value | 84,981 | 100,472
Net Carrying Value | $ 84,981 | $ 100,465

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