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Other Assets and Other Liabilities (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of deferred tax assets and liabilities [Line Items] |  |  |
Operating loss carryforwards |  |  | $ 856,400
Taxable REIT Subsidiaries [Member] |  |  |
Schedule of deferred tax assets and liabilities [Line Items] |  |  |
Deferred tax assets | [1] | $ 64,165 | 54,318
Valuation allowance |  | (64,165) | (54,318)
Net deferred tax assets (liabilities) |  | 0 | 0
Real estate basis differences |  | 41,700 | 45,200
Deferred expenses differences |  | 18,900 | 5,000
Operating loss carryforwards |  | $ 3,600 | $ 4,100
[1] | Deferred tax assets as of September 30, 2015 include timing differences related primarily to asset basis of $41.7 million, deferred expenses and other items of $18.9 million and net operating loss ("NOL") carryforwards of $3.6 million. Deferred tax assets as of December 31, 2014, include timing differences related primarily to asset basis of $45.2 million, NOL carryforwards of $4.1 million and deferred expenses and other items of $5.0 million.

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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