CONSOLIDATED STATEMENTS OF OPERATIONS PARENTHETICALS (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property operating expenses from affiliates and related parties	$ 61	$ 8	$ 15
General and administrative from affilites and related parties	334	260	278
Interest income from affiliates and related parties	$ 5,183	$ 4,447	$ 4,292

The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business).

No definition available.

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Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration