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Accounts Receivable - Summary of changes in allowance for doubtful accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$ 8,093	$ 8,695
Bad debt expense	1,784	2,868
Accounts written-off	(1,132)	(3,820)
Recoveries	365	350
Ending balance	$ 9,110	$ 8,093

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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