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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Loans modified through troubled debt restructurings |  | $ 10,400,000 |
Average Recorded Investment | $ 153,387,000 | 422,973,000 | $ 943,761,000
Interest Income Recognized | 50,000 | 2,261,000 | 17,618,000
Senior mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 129,135,000 | 370,010,000 | 825,656,000
Interest Income Recognized | 38,000 | 2,080,000 | 11,245,000
Corporate/Partnership loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 24,252,000 | 52,963,000 | 85,723,000
Interest Income Recognized | 12,000 | 181,000 | 6,373,000
Subordinate mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 0 | 0 | 32,382,000
Interest Income Recognized | 0 | 0 | 0
Nonperforming loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivable, interest income, cash basis method | 0 | 0 | 13,300,000
With an allowance recorded |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 132,492,000 | 139,672,000 |
Unpaid Principal Balance | 131,514,000 | 138,801,000 |
Related Allowance | (72,165,000) | (64,990,000) |
Average Recorded Investment | 153,387,000 | 387,314,000 | 904,290,000
Interest Income Recognized | 50,000 | 339,000 | 2,299,000
With an allowance recorded | Senior mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 126,754,000 | 130,645,000 |
Unpaid Principal Balance | 125,776,000 | 129,744,000 |
Related Allowance | (69,627,000) | (64,440,000) |
Average Recorded Investment | 129,135,000 | 334,351,000 | 794,247,000
Interest Income Recognized | 38,000 | 158,000 | 1,976,000
With an allowance recorded | Corporate/Partnership loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,738,000 | 9,027,000 |
Unpaid Principal Balance | 5,738,000 | 9,057,000 |
Related Allowance | (2,538,000) | (550,000) |
Average Recorded Investment | 0 | 52,963,000 | 77,661,000
Interest Income Recognized | 0 | 181,000 | 323,000
With an allowance recorded | Subordinate mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 24,252,000 | 0 | 32,382,000
Interest Income Recognized | 12,000 | 0 | 0
With no related allowance recorded |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 0 | 35,659,000 | 39,471,000
Interest Income Recognized | 0 | 1,922,000 | 15,319,000
With no related allowance recorded | Senior mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 0 | 35,659,000 | 31,409,000
Interest Income Recognized | 0 | 1,922,000 | 9,269,000
With no related allowance recorded | Corporate/Partnership loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 0 | 0 | 8,062,000
Interest Income Recognized | $ 0 | $ 0 | $ 6,050,000

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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 The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + 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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