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Supplemental Cash Flow Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Non-cash consideration paid for business acquisitions and intangible assets
Business acquisitions, including contingent consideration earned	$ 12,603	$ 19,601	$ 19,115
Estimated contingent purchase price payable	$ 15,659	$ 9,735	$ 11,689

The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future.

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