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Profit Sharing Plan:	12 Months Ended
Dec. 31, 2011
Profit Sharing Plan: [Abstract]
Profit Sharing Plan:	Note 11. Profit Sharing Plan: We have a profit sharing plan available to our full-time employees after one year of employment. Vesting increases ratably to 100% after the sixth year of employment. Pursuant to our profit sharing plan, approximately $234,000, $216,000 and $199,000 was expensed during 2011, 2010 and 2009, respectively. Contributions to the profit sharing plan are at the discretion of our Board of Trust Managers.

Profit Sharing Plan:

12 Months Ended

Dec. 31, 2011

Note 11. Profit Sharing Plan:

We have a profit sharing plan available to our full-time employees after one year of employment. Vesting increases ratably to 100% after the sixth year of employment. Pursuant to our profit sharing plan, approximately $234,000, $216,000 and $199,000 was expensed during 2011, 2010 and 2009, respectively. Contributions to the profit sharing plan are at the discretion of our Board of Trust Managers.