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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 296,700 |  | $ 296,700 |  | $ 132,492
Unpaid Principal Balance | 284,878 |  | 284,878 |  | 131,514
Related Allowance | (74,216) |  | (74,216) |  | (72,165)
Average Recorded Investment | 224,777 | $ 178,862 | 180,867 | $ 158,610 |
Interest Income Recognized | 114 | 4 | 226 | 50 |
Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,564 |  | 11,564 |  | 0
Unpaid Principal Balance | 11,548 |  | 11,548 |  | 0
Related Allowance | 0 |  | 0 |  | 0
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,564 |  | 11,564 |  | 0
Unpaid Principal Balance | 11,548 |  | 11,548 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 16,175 | 0 | 10,359 | 0 |
Interest Income Recognized | 114 | 0 | 226 | 0 |
With no related allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 4,608 | 0 | 4,575 | 0 |
Interest Income Recognized | 114 | 0 | 226 | 0 |
With no related allowance recorded | Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 11,567 | 0 | 5,784 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 285,136 |  | 285,136 |  | 132,492
Unpaid Principal Balance | 273,330 |  | 273,330 |  | 131,514
Related Allowance | (74,216) |  | (74,216) |  | (72,165)
Average Recorded Investment | 208,602 | 178,862 | 170,508 | 158,610 |
Interest Income Recognized | 0 | 4 | 0 | 50 |
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 127,965 |  | 127,965 |  | 126,754
Unpaid Principal Balance | 126,547 |  | 126,547 |  | 125,776
Related Allowance | (61,745) |  | (61,745) |  | (69,627)
Average Recorded Investment | 127,494 | 128,969 | 127,169 | 129,730 |
Interest Income Recognized | 0 | 4 | 0 | 38 |
With an allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 157,171 |  | 157,171 |  | 5,738
Unpaid Principal Balance | 146,783 |  | 146,783 |  | 5,738
Related Allowance | (12,471) |  | (12,471) |  | $ (2,538)
Average Recorded Investment | 81,108 | 49,893 | 43,339 | 28,880 |
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 12 |

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- Definition The interest income recognized on a cash-basis or accrual method of accounting during the time within that period that the financing receivables were impaired. + References No definition available. + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524 + Details
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