Notes and Bonds Payable (Details 2) (Senior Notes Due 2014 [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Senior Notes Due 2014 [Member]
Reconciliation of Senior Notes due 2014
Mortgage notes	$ 264,737	$ 264,737
Unaccreted discount	(366)	(510)
Senior Notes, carrying amount	$ 264,371	$ 264,227

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant