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Accounts Receivable (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Roll Forward]
Balance, beginning of year	$ 3,079	$ 3,764	$ 2,907
Provisions	1,055	1,799	2,250
Charges	(1,327)	(2,484)	(1,393)
Balance, end of year	$ 2,807	$ 3,079	$ 3,764

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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