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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | May 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | $ 703,279 |  | $ 919,493 |  |  |
Reserves for loan losses | (28,634) |  | (53,395) |  | $ (78,489) | $ (85,545)
Total loans receivable, net | 674,645 |  | 866,098 |  |  |
Other lending investments | 153,216 |  | 122,126 |  |  |
Total loans receivable and other lending investments, net | 827,861 |  | 988,224 |  |  |
Purchase price for properties acquired from lessee | 44,300 | $ 44,100 |  |  |  |
Senior mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 572,584 |  | 760,749 |  |  |
Corporate/Partnership loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 119,818 |  | 148,583 |  |  |
Subordinate mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | $ 10,877 |  | $ 10,161 |  |  |
Nonperforming Financial Instruments | Corporate/Partnership loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans |  |  |  | $ 145,800 |  |

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