Significant Accounting Policies (Details)	12 Months Ended
Dec. 31, 2011 years
Distribution percent for exemption from federal income tax	90.00%
Building [Member]
Property, Plant and Equipment, Useful Life, Average	40
Building Improvements [Member]
Property, Plant and Equipment, Useful Life, Minimum	3
Property, Plant and Equipment, Useful Life, Maximum	25

The average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration