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Notes Receivable (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 45,924 $ 25,801
Less current portion 11,597 8,464
Notes receivable - non-current 34,327 17,337
Independent Contractors [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 38,450 $ 19,021
Number of notes receivable 682 472
Other Debtors [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable $ 7,474 $ 6,780