Mortgage Notes Payable Text Detail (Details Textual) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Mortgage Notes Payable (Textual) [Abstract]
Prime Rate	3.25%
Debt Instrument, Basis Spread on Variable Rate	1.50%
Debt Instrument, Collateral Amount	$ 932,000	$ 955,000

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant