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Notes Receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes Receivable	$ 19,375	$ 16,933
Less current portion	5,514	4,900
Notes Receivable - non-current	13,861	12,033
Independent Contractors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes Receivable	12,468	9,304
Number Of Notes Receivable	331	289
Other Debtors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes Receivable	$ 6,907	$ 7,629

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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