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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Non-performing loan |  |  |  |  |  |
Total gross carrying value of loans | $ 963,975 |  |  | $ 963,975 |  | $ 1,289,568
Preferred equity security, face value |  | $ 100,000 |  |  |  |
Preferred equity security, mandatory redemption period |  | 5 years |  |  |  |
Average Recorded Investment | 67,001 |  | $ 243,907 | 148,998 | $ 248,138 |
Interest Income Recognized | 209 |  | 385 | 301 | 385 |
With no related allowance recorded |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Average Recorded Investment | 0 |  | 5,501 | 0 | 8,227 |
Interest Income Recognized | 209 |  | 385 | 301 | 385 |
With an allowance recorded |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Recorded Investment | 66,936 |  |  | 66,936 |  | 237,877
Unpaid Principal Balance | 67,133 |  |  | 67,133 |  | 227,280
Related Allowance | (40,395) |  |  | (40,395) |  | (60,989)
Average Recorded Investment | 67,001 |  | 238,406 | 148,998 | 239,911 |
Interest Income Recognized | 0 |  | 0 | 0 | 0 |
Nonrecurring Basis | Fair Value, Inputs, Level 3 |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Preferred equity security, fair value |  | $ 77,000 |  |  |  |
Senior mortgages |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Total gross carrying value of loans | 801,595 |  |  | 801,595 |  | 791,152
Average Recorded Investment | 67,001 |  | 82,007 | 70,696 | 83,100 |
Interest Income Recognized | 0 |  | 0 | 0 | 0 |
Senior mortgages | With an allowance recorded |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Recorded Investment | 66,936 |  |  | 66,936 |  | 81,343
Unpaid Principal Balance | 67,133 |  |  | 67,133 |  | 81,431
Related Allowance | (40,395) |  |  | (40,395) |  | (48,518)
Average Recorded Investment | 67,001 |  | 82,007 | 70,696 | 83,100 |
Interest Income Recognized | 0 |  | 0 | 0 | 0 |
Corporate/Partnership loans |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Total gross carrying value of loans | 152,390 |  |  | 152,390 |  | 488,921
Average Recorded Investment | 0 |  | 156,399 | 78,302 | 156,811 |
Interest Income Recognized | 0 |  | 0 | 0 | 0 |
Corporate/Partnership loans | With an allowance recorded |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Recorded Investment | 0 |  |  | 0 |  | 156,534
Unpaid Principal Balance | 0 |  |  | 0 |  | 145,849
Related Allowance | 0 |  |  | 0 |  | (12,471)
Average Recorded Investment | 0 |  | 156,399 | 78,302 | 156,811 |
Interest Income Recognized | 0 |  | 0 | 0 | 0 |
Subordinate mortgages |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Total gross carrying value of loans | 9,990 |  |  | 9,990 |  | $ 9,495
Average Recorded Investment | 0 |  | 5,501 | 0 | 8,227 |
Interest Income Recognized | 209 |  | 385 | 301 | 385 |
Subordinate mortgages | With no related allowance recorded |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Average Recorded Investment | 0 |  | 5,501 | 0 | 8,227 |
Interest Income Recognized | $ 209 |  | $ 385 | $ 301 | $ 385 |
Non-Performing Loan | Corporate/Partnership loans |  |  |  |  |  |
Non-performing loan |  |  |  |  |  |
Total gross carrying value of loans |  | 145,800 |  |  |  |
Proceeds from repayment of loan |  | 45,800 |  |  |  |
Loan loss provision |  | $ 21,400 |  |  |  |

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