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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | $ 145,590 | $ 250,230 | $ 176,352 | $ 251,467 |
Interest Income Recognized | 0 | 0 | 92 | 0 |
Non-performing loan |  |  |  |  |
Total gross carrying value of loans | 989,002 |  | 989,002 |  | $ 1,289,568
Preferred equity security, face value | $ 100,000 |  | 100,000 |  |
Preferred equity security, mandatory redemption period | 5 years |  |  |  |
Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | $ 67,252 | 82,368 | 71,949 | 83,556 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Non-performing loan |  |  |  |  |
Total gross carrying value of loans | 849,192 |  | 849,192 |  | 791,152
Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 78,338 | 156,839 | 104,403 | 156,941 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Non-performing loan |  |  |  |  |
Total gross carrying value of loans | 129,988 |  | 129,988 |  | 488,921
Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 | 11,023 | 0 | 10,970 |
Interest Income Recognized | 0 | 0 | 92 | 0 |
Non-performing loan |  |  |  |  |
Total gross carrying value of loans | 9,822 |  | 9,822 |  | 9,495
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 | 11,023 | 0 | 10,970 |
Interest Income Recognized | 0 | 0 | 92 | 0 |
With no related allowance recorded | Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 | 11,023 | 0 | 10,970 |
Interest Income Recognized | 0 | 0 | 92 | 0 |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 67,068 |  | 67,068 |  | 237,877
Unpaid Principal Balance | 67,451 |  | 67,451 |  | 227,280
Related Allowance | (40,395) |  | (40,395) |  | (60,989)
Average Recorded Investment | 145,590 | 239,207 | 176,352 | 240,497 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 67,068 |  | 67,068 |  | 81,343
Unpaid Principal Balance | 67,451 |  | 67,451 |  | 81,431
Related Allowance | (40,395) |  | (40,395) |  | (48,518)
Average Recorded Investment | 67,252 | 82,368 | 71,949 | 83,556 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 156,534
Unpaid Principal Balance | 0 |  | 0 |  | 145,849
Related Allowance | 0 |  | 0 |  | $ (12,471)
Average Recorded Investment | 78,338 | 156,839 | 104,403 | 156,941 |
Interest Income Recognized | 0 | $ 0 | 0 | $ 0 |
Non-performing loan | Corporate/Partnership loans |  |  |  |  |
Non-performing loan |  |  |  |  |
Total gross carrying value of loans | 145,800 |  | $ 145,800 |  |
Proceeds from repayment of loan | 45,800 |  |  |  |
Loan loss provision | $ 21,400 |  |  |  |

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