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Loans Receivable and Other Lending Investments, net (Schedule of Loans Receivable) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | $ 963,975 |  | $ 1,289,568 |  |  |
Reserves for loan losses | (54,695) | $ (54,495) | (78,489) | $ (76,189) | $ (78,789) | $ (85,545)
Total loans receivable, net | 909,280 |  | 1,211,079 |  |  |
Other lending investments—securities | 119,772 |  | 89,576 |  |  |
Total loans receivable and other lending investments, net | 1,029,052 |  | 1,300,655 |  |  |
Senior mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 801,595 |  | 791,152 |  |  |
Corporate/Partnership loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | 152,390 |  | 488,921 |  |  |
Corporate/Partnership loans | Non-Performing Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans |  | $ 145,800 |  |  |  |
Subordinate mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross carrying value of loans | $ 9,990 |  | $ 9,495 |  |  |

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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