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Income Taxes (Details) (Taxable REIT Subsidiary [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Taxable REIT Subsidiary [Member] |  |  |  |
Deferred income tax (expense) benefit |  |  |  |
Federal | $ (17) | $ (13) | $ (30) | $ (180)
State | (4) | (4) | (7) | (41)
Total income tax expense | $ (21) | $ (17) | $ (37) | $ (221)
Effective tax rate (as a percent) | 36.30% | 38.60% | 36.30% | 38.60%

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