Balance Sheet Account Detail Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 25,661	$ 22,600
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	23,615	21,212
Allowance for doubtful accounts	237	472
VAT receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	$ 2,046	$ 1,388