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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts and other accounts receivable allowances
Balance at beginning of year	$ 5,214	$ 6,145	$ 6,762
Provision charged (credited) to income	314	(568)	(108)
Accounts written off, net of recoveries	5	(363)	(509)
Balance at end of year	$ 5,533	$ 5,214	$ 6,145

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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