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Fair Value Measurements (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses | $ 1,238 | $ 1,302 | $ 1,238 | $ 1,302
Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | 27,690 | 9,796 | 27,690 | 9,796
Impairment losses | 1,238 | 1,302 | 1,238 | 1,302
Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | $ 27,690 | $ 9,796 | $ 27,690 | $ 9,796

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