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Notes Payable and Revolving Credit Agreement (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of aggregate annual payments of principal required to revolving credit facility
During the twelve months ended June 30, 2013	$ 609
During the twelve months ended June 30, 2014	275
During the twelve months ended June 30, 2015
During the twelve months ended June 30, 2016	20,000
Payments, Total	$ 20,884	$ 24,217

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