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Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts [Roll Forward]
Balance, beginning of year	$ 1,057	$ 228	$ 315
Charges (reductions) to expense	744	1,037	(68)
Uncollected balances written off, net of recoveries	(1,077)	(208)	(19)
Balance, end of year	$ 724	$ 1,057	$ 228

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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