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Basis of Presentation and Significant Accounting Policies - 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 Receivable [Roll Forward]
Balance, beginning of year	$ 3,584	$ 3,848	$ 4,195
Add Provision charged to expense	1,420	523	777
Add Recoveries	90	140	186
Add Other	0	157	0
Less Charges against allowance	(1,565)	(1,084)	(1,310)
Balance, end of year	$ 3,529	$ 3,584	$ 3,848

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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