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Other Assets and Other Liabilities (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of deferred tax assets and liabilities [Line Items] |  |  |  |
Operating loss carryforwards |  |  |  | $ 759,800
Taxable REIT Subsidiaries [Member] |  |  |  |
Schedule of deferred tax assets and liabilities [Line Items] |  |  |  |
Deferred tax assets | [1] | $ 64,793 | $ 54,318 |
Valuation allowance |  | (64,793) | (54,318) |
Net deferred tax assets (liabilities) |  | 0 | 0 |
Real estate basis differences |  | 42,400 | 39,300 |
Investments basis differences |  | 8,500 | 5,900 |
Deferred expenses differences |  | 7,400 | 2,700 |
Operating loss carryforwards |  | $ 4,200 | $ 4,100 |
[1] | Deferred tax assets as of June 30, 2015 include timing differences related primarily to real estate basis of $42.4 million, investment basis of $8.5 million, deferred expenses of $7.4 million, and net operating loss carryforwards of $4.2 million. Deferred tax assets as of December 31, 2014, include timing differences related primarily to real estate basis of $39.3 million, investment basis of $5.9 million, net operating loss carryforwards of $4.1 million, and deferred expenses of $2.7 million.

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