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Loans Receivable and Other Lending Investments, net (Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract] |  |
Total | $ 21,230 |
Estimated Fair Value | 22,842 |
Held-to-Maturity Securities, Debt Maturities [Abstract] |  |
Total | 66,734 |
Estimated Fair Value | 68,315 |
Investments, Debt and Equity Securities [Abstract] |  |
Face Value | 87,848 | $ 79,694
Amortized Cost Basis | 87,964 | 79,490
Net Unrealized Gain (Loss) | 3,193 | 3,179
Estimated Fair Value | 91,157 | 82,669
Net Carrying Value | 89,576 | 79,916
Municipal Bonds |  |
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract] |  |
Face Value | 21,230 | 21,240
Total | 21,230 | 21,240
Net Unrealized Gain (Loss) | 1,612 | 426
Estimated Fair Value | 22,842 | 21,666
Net Carrying Value | 22,842 | 21,666
Corporate Debt Securities |  |
Held-to-Maturity Securities, Debt Maturities [Abstract] |  |
Face Value | 66,618 | 58,454
Total | 66,734 | 58,250
Net Unrealized Gain | 1,581 | 2,753
Estimated Fair Value | 68,315 | 61,003
Net Carrying Value | $ 66,734 | $ 58,250

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