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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost Basis | $ 21,185 |
Estimated Fair Value | 21,661 |
Held-to-Maturity Securities, Debt Maturities [Abstract] |  |
Amortized Cost Basis | 100,465 |
Estimated Fair Value | 100,472 |
Investments, Debt and Equity Securities [Abstract] |  |
Face Value | 142,051 | $ 87,848
Amortized Cost Basis | 121,650 | 87,964
Net Unrealized Gain (Loss) | 483 | 3,193
Estimated Fair Value | 122,133 | 91,157
Net Carrying Value | 122,126 | 89,576
Municipal Bonds |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Face Value | 21,185 | 21,230
Amortized Cost Basis | 21,185 | 21,230
Net Unrealized Gain (Loss) | 476 | 1,612
Estimated Fair Value | 21,661 | 22,842
Net Carrying Value | 21,661 | 22,842
Corporate Debt Securities |  |
Held-to-Maturity Securities, Debt Maturities [Abstract] |  |
Face Value | 120,866 | 66,618
Amortized Cost Basis | 100,465 | 66,734
Net Unrealized Gain | 7 | 1,581
Estimated Fair Value | 100,472 | 68,315
Net Carrying Value | $ 100,465 | $ 66,734

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