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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 238,155 |  | $ 238,155 |  | $ 253,941
Unpaid Principal Balance | 227,697 |  | 227,697 |  | 243,409
Related Allowance | (60,989) |  | (60,989) |  | (62,245)
Average Recorded Investment | 243,907 | $ 224,777 | 248,138 | $ 180,867 |
Interest Income Recognized | 385 | 114 | 385 | 226 |
Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 81,732 |  | 81,732 |  | 85,933
Unpaid Principal Balance | 81,848 |  | 81,848 |  | 85,780
Related Allowance | (48,518) |  | (48,518) |  | (49,774)
Average Recorded Investment | 82,007 | 132,102 | 83,100 | 131,744 |
Interest Income Recognized | 0 | 114 | 0 | 226 |
Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 156,423 |  | 156,423 |  | 157,146
Unpaid Principal Balance | 145,849 |  | 145,849 |  | 146,783
Related Allowance | (12,471) |  | (12,471) |  | (12,471)
Average Recorded Investment | 156,399 | 81,108 | 156,811 | 43,339 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 10,862
Unpaid Principal Balance | 0 |  | 0 |  | 10,846
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 5,501 | 11,567 | 8,227 | 5,784 |
Interest Income Recognized | 385 | 0 | 385 | 0 |
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 10,862
Unpaid Principal Balance | 0 |  | 0 |  | 10,846
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 5,501 | 16,175 | 8,227 | 10,359 |
Interest Income Recognized | 385 | 114 | 385 | 226 |
With no related allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 | 4,608 | 0 | 4,575 |
Interest Income Recognized | 0 | 114 | 0 | 226 |
With no related allowance recorded | Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 10,862
Unpaid Principal Balance | 0 |  | 0 |  | 10,846
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 5,501 | 11,567 | 8,227 | 5,784 |
Interest Income Recognized | 385 | 0 | 385 | 0 |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 238,155 |  | 238,155 |  | 243,079
Unpaid Principal Balance | 227,697 |  | 227,697 |  | 232,563
Related Allowance | (60,989) |  | (60,989) |  | (62,245)
Average Recorded Investment | 238,406 | 208,602 | 239,911 | 170,508 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 81,732 |  | 81,732 |  | 85,933
Unpaid Principal Balance | 81,848 |  | 81,848 |  | 85,780
Related Allowance | (48,518) |  | (48,518) |  | (49,774)
Average Recorded Investment | 82,007 | 127,494 | 83,100 | 127,169 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 156,423 |  | 156,423 |  | 157,146
Unpaid Principal Balance | 145,849 |  | 145,849 |  | 146,783
Related Allowance | (12,471) |  | (12,471) |  | $ (12,471)
Average Recorded Investment | 156,399 | 81,108 | 156,811 | 43,339 |
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0 |

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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=84173941&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=84173941&loc=d3e5258-111524 + Details
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