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Other Assets and Other Liabilities (Details 2) (USD $) | Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets(1) | $ 51,473,000 | [1] | $ 40,800,000 | [1] |
Valuation allowance | (51,473,000) |  | (40,800,000) |  |
Net deferred tax assets (liabilities) | 0 |  | 0 |  |
Operating loss carryforwards |  |  |  |  | 423,900,000
Taxable REIT Subsidiaries (TRS) |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Real estate asset basis differences | 32,000,000 |  | 31,200,000 |  |
Operating loss carryforwards | 6,500,000 |  | 10,800,000 |  |
Investment basis differences | $ 8,500,000 |  | $ (1,200,000) |  |
[1] | Deferred tax assets as of June 30, 2013, include real estate basis differences of $32.0 million, net operating loss carryforwards of $6.5 million, investment basis differences of $8.5 million and capital loss carryforwards of $4.3 million. Deferred tax assets as of December 31, 2012, include real estate basis differences of $31.2 million, net operating loss carryforwards of $10.8 million and investment basis differences of $(1.2) million.

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