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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes
Maximum ownership as a percentage of the voting power or value of the securities of each issuer other than REIT or "TRS"			10.00%
Maximum ownership of securities in all TRS (as a percent)			25.00%
Maximum ownership of securities in all TRS when considered together with other non-real estate assets (as a percent)			25.00%
Period of statute of limitations applicable to the entity's income tax returns			3 years
Increase (decrease) in taxes resulting from:
Revised Texas Franchise tax rate (as a percent)			0.70%
Revised Texas franchise tax			$ 223	$ 154
Other Taxes			11	2
Income tax expense	115	77	234	156
Deferred income taxes			$ 0

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Represents the Revised Texas Franchise Tax rate as a percentage of revenues at Texas properties commencing with 2007 revenues.

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The portion of the difference between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the Revised Texas Franchise Tax.

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- Definition

Represents the maximum ownership in all Taxable REIT Subsidiaries that can be held by the entity as a percentage of its assets value to maintain its REIT status.

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Represents the maximum ownership in all Taxable REIT Subsidiaries that can be held by the entity as a percentage of its assets value when considered together with other non-real estate assets to maintain its REIT status.

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Represents the maximum ownership that the entity can hold as a percentage of the voting power or value of the securities of each issuer which is not a REIT or Taxable REIT Subsidiary.

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Represents the period of statute of limitations for the entity's income tax returns, that remain subject to examination.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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