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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 249,659 |  | $ 249,659 |  | $ 253,941
Unpaid Principal Balance | 239,224 |  | 239,224 |  | 243,409
Related Allowance | (60,989) |  | (60,989) |  | (62,245)
Average Recorded Investment | 250,230 | $ 147,137 | 251,467 | $ 142,256 |
Interest Income Recognized | 0 | 111 | 0 | 111 |
Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 82,282 |  | 82,282 |  | 85,933
Unpaid Principal Balance | 82,390 |  | 82,390 |  | 85,780
Related Allowance | (48,518) |  | (48,518) |  | (49,774)
Average Recorded Investment | 82,368 | 136,128 | 83,556 | 133,003 |
Interest Income Recognized | 0 | 111 | 0 | 111 |
Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,002 |  | 11,002 |  | 10,862
Unpaid Principal Balance | 10,985 |  | 10,985 |  | 10,846
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 11,023 | 5,785 | 10,970 | 3,857 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 156,375 |  | 156,375 |  | 157,146
Unpaid Principal Balance | 145,849 |  | 145,849 |  | 146,783
Related Allowance | (12,471) |  | (12,471) |  | (12,471)
Average Recorded Investment | 156,839 | 5,224 | 156,941 | 5,396 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,002 |  | 11,002 |  | 10,862
Unpaid Principal Balance | 10,985 |  | 10,985 |  | 10,846
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 11,023 | 14,935 | 10,970 | 9,957 |
Interest Income Recognized | 0 | 111 | 0 | 111 |
With no related allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment | 0 | 9,150 | 0 | 6,100 |
Interest Income Recognized | 0 | 111 | 0 | 111 |
With no related allowance recorded | Subordinate mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,002 |  | 11,002 |  | 10,862
Unpaid Principal Balance | 10,985 |  | 10,985 |  | 10,846
Related Allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 11,023 | 5,785 | 10,970 | 3,857 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 238,657 |  | 238,657 |  | 243,079
Unpaid Principal Balance | 228,239 |  | 228,239 |  | 232,563
Related Allowance | (60,989) |  | (60,989) |  | (62,245)
Average Recorded Investment | 239,207 | 132,202 | 240,497 | 132,299 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded | Senior mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 82,282 |  | 82,282 |  | 85,933
Unpaid Principal Balance | 82,390 |  | 82,390 |  | 85,780
Related Allowance | (48,518) |  | (48,518) |  | (49,774)
Average Recorded Investment | 82,368 | 126,978 | 83,556 | 126,903 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
With an allowance recorded | Corporate/Partnership loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 156,375 |  | 156,375 |  | 157,146
Unpaid Principal Balance | 145,849 |  | 145,849 |  | 146,783
Related Allowance | (12,471) |  | (12,471) |  | $ (12,471)
Average Recorded Investment | 156,839 | 5,224 | 156,941 | 5,396 |
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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