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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 152,855 |  | $ 152,855 |  | $ 132,492
Unpaid Principal Balance | 151,681 |  | 151,681 |  | 131,514
Related Allowance | (73,371) |  | (73,371) |  | (72,165)
Average Recorded Investment | 147,137 | $ 158,317 | 142,256 | $ 152,102 |
Interest Income Recognized | 111 | 20 | 111 | 46 |
Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,570 |  | 11,570 |  | 0
Unpaid Principal Balance | 11,553 |  | 11,553 |  | 0
Related Allowance | 0 |  | 0 |  | 0
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 20,787 |  | 20,787 |  | 0
Unpaid Principal Balance | 20,753 |  | 20,753 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 14,935 | 0 | 9,957 | 0 |
Interest Income Recognized | 111 | 0 | 111 | 0 |
With no related allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 9,217 |  | 9,217 |  | 0
Unpaid Principal Balance | 9,200 |  | 9,200 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 9,150 | 0 | 6,100 | 0 |
Interest Income Recognized | 111 | 0 | 111 | 0 |
With no related allowance recorded | Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 5,785 |  | 3,857 |  |
Interest Income Recognized | 0 |  | 0 |  |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 132,068 |  | 132,068 |  | 132,492
Unpaid Principal Balance | 130,928 |  | 130,928 |  | 131,514
Related Allowance | (73,371) |  | (73,371) |  | (72,165)
Average Recorded Investment | 132,202 | 158,317 | 132,299 | 152,102 |
Interest Income Recognized | 0 | 20 | 0 | 46 |
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 127,023 |  | 127,023 |  | 126,754
Unpaid Principal Balance | 125,886 |  | 125,886 |  | 125,776
Related Allowance | (70,833) |  | (70,833) |  | (69,627)
Average Recorded Investment | 126,978 | 130,016 | 126,903 | 130,226 |
Interest Income Recognized | 0 | 17 | 0 | 34 |
With an allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 5,045 |  | 5,045 |  | 5,738
Unpaid Principal Balance | 5,042 |  | 5,042 |  | 5,738
Related Allowance | (2,538) |  | (2,538) |  | $ (2,538)
Average Recorded Investment | 5,224 | 28,301 | 5,396 | 21,876 |
Interest Income Recognized | $ 0 | $ 3 | $ 0 | $ 12 |

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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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