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Notes and Other Receivables, Net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]    
Trade accounts receivable $ 4,470   
Notes receivable, net 2,912 2,817
Interest receivable 237 228
Other receivables 2,868 3,624
Notes and other receivables, net $ 10,487 $ 6,669