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Concentration of Credit Risk (Details) (USD $)	12 Months Ended
Concentration of Credit Risk (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Concentration Risk [Line Items]
Allowance for doubtful accounts	$ 651,000	$ 2,757,000
Bad debt expense	377,000	1,921,000	1,549,000
Accounts receivable, gross	143,009,000	163,493,000
Cash and cash equivalents and restricted cash	$ 41,800,000
Maximum
Concentration Risk [Line Items]
Write offs to bad debt, percentage of net sales	1.00%	1.00%	1.00%
Revenue \| Customer Concentration Risk \| Largest Ten Customers
Concentration Risk [Line Items]
Concentration risk	69.00%

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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