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Future Minimum Lease Payments (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Leases, Operating [Abstract]    
Operating Leases, Rent Expense, Net $ 539,000 $ 543,000
Lease purchase option expiration date May 31, 2014  
Land under Purchase Options, Not Recorded $ 27,500,000