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Accounts Receivable - Narrative (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts Receivable and Allowance for Doubtful Accounts [Abstract]
Accounts Receivable Gross Current	$ 160,596	$ 155,245
Accounts Receivable Greater Than 90 Days Past Due	9,401	6,112
Business Combination, Acquired Receivables, Estimated Uncollectible	$ 416	$ 146	$ 0

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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