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Other Assets and Other Liabilities (Deferred Tax Assets and Liabilities) (Details) (USD $) | Dec. 31, 2012 | Mar. 31, 2014 Taxable REIT Subsidiaries | Dec. 31, 2013 Taxable REIT Subsidiaries
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Schedule of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets |  | $ 56,801,000 | [1] | $ 55,962,000 | [1]
Valuation allowance |  | (56,801,000) |  | (55,962,000) |
Net deferred tax assets (liabilities) |  | 0 |  | 0 |
Real estate asset basis differences |  | 33,300,000 |  | 33,000,000 |
Operating loss carryforwards | 608,000,000 | 16,000,000 |  | 14,900,000 |
Investment basis differences |  | $ 7,500,000 |  | $ 8,100,000 |
[1] | Deferred tax assets as of March 31, 2014 include real estate basis differences of $33.3 million, net operating loss carryforwards of $16.0 million and investment basis differences of $7.5 million. Deferred tax assets as of December 31, 2013 include real estate basis differences of $33.0 million, net operating loss carryforwards of $14.9 million and investment basis differences of $8.1 million.

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- Definition The difference in the tax basis and carrying amounts of real estate assets of investments, before tax effects. + References No definition available. + Details
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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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- Definition Amount after 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),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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