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Notes Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 25,806 $ 19,375
Less current portion 8,895 5,514
Notes receivable - non-current 16,911 13,861
Independent Contractors [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable 18,475 12,468
Number of notes receivable 466 331
Other Debtors [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 7,331 $ 6,907