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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | $ 989,002 |  | $ 1,289,568 |  |  |
Reserves for loan losses | (54,495) | $ (69,466) | (78,489) | $ (78,789) | $ (79,389) | $ (85,545)
Total loans receivable, net | 934,507 |  | 1,211,079 |  |  |
Other lending investments—securities | 118,365 |  | 89,576 |  |  |
Total loans receivable and other lending investments, net | 1,052,872 |  | 1,300,655 |  |  |
Senior mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 849,192 |  | 791,152 |  |  |
Corporate/Partnership loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 129,988 |  | 488,921 |  |  |
Subordinate mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 9,822 |  | $ 9,495 |  |  |
Non-performing loan | Corporate/Partnership loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | $ 145,800 |  |  |  |  |

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