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Loans Receivable and Other Lending Investments, net (Impaired Loans) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 237,877,000 | $ 253,941,000 |
Unpaid Principal Balance | 227,280,000 | 243,409,000 |
Related Allowance | (60,989,000) | (62,245,000) |
Average Recorded Investment | 246,087,000 | 195,482,000 | $ 153,387,000
Interest Income Recognized | 1,127,000 | 226,000 | 50,000
Subordinate mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 10,862,000 |
Unpaid Principal Balance | 0 | 10,846,000 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 6,582,000 | 6,799,000 | 0
Interest Income Recognized | 1,127,000 | 0 | 0
Senior mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 81,343,000 | 85,933,000 |
Unpaid Principal Balance | 81,431,000 | 85,780,000 |
Related Allowance | (48,518,000) | (49,774,000) |
Average Recorded Investment | 82,749,000 | 122,582,000 | 129,135,000
Interest Income Recognized | 0 | 226,000 | 38,000
Corporate/Partnership loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 156,534,000 | 157,146,000 |
Unpaid Principal Balance | 145,849,000 | 146,783,000 |
Related Allowance | (12,471,000) | (12,471,000) |
Average Recorded Investment | 156,756,000 | 66,101,000 | 24,252,000
Interest Income Recognized | 0 | 0 | 12,000
Nonperforming Financial Instruments |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivable, interest income, cash basis method |  | 0 | 0
With no related allowance recorded |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 10,862,000 |
Unpaid Principal Balance | 0 | 10,846,000 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 6,582,000 | 10,460,000 | 0
Interest Income Recognized | 1,127,000 | 226,000 | 0
With no related allowance recorded | Subordinate mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 10,862,000 |
Unpaid Principal Balance | 0 | 10,846,000 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 6,582,000 | 6,799,000 |
Interest Income Recognized | 1,127,000 | 0 | 0
With no related allowance recorded | Senior mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 0 | 3,661,000 | 0
Interest Income Recognized | 0 | 226,000 | 0
With an allowance recorded |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 237,877,000 | 243,079,000 |
Unpaid Principal Balance | 227,280,000 | 232,563,000 |
Related Allowance | (60,989,000) | (62,245,000) |
Average Recorded Investment | 239,505,000 | 185,022,000 | 153,387,000
Interest Income Recognized | 0 | 0 | 50,000
With an allowance recorded | Senior mortgages |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 81,343,000 | 85,933,000 |
Unpaid Principal Balance | 81,431,000 | 85,780,000 |
Related Allowance | (48,518,000) | (49,774,000) |
Average Recorded Investment | 82,749,000 | 118,921,000 | 129,135,000
Interest Income Recognized | 0 | 0 | 38,000
With an allowance recorded | Corporate/Partnership loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 156,534,000 | 157,146,000 |
Unpaid Principal Balance | 145,849,000 | 146,783,000 |
Related Allowance | (12,471,000) | (12,471,000) |
Average Recorded Investment | 156,756,000 | 66,101,000 | 24,252,000
Interest Income Recognized | $ 0 | $ 0 | $ 12,000

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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 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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