Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued payroll and benefits	$ 34,352	$ 41,827
Accrued sales rebate	8,501	8,358
Accrued sales tax and value added tax	6,360	7,052
Unclaimed merger consideration	1,564	4,026
Accrued warranty	4,130	3,177
Accrued sales and marketing expenses	2,681	3,508
Accrued accounts payable	2,991	3,048
Accrued professional fees	2,165	654
Customer Advances and Deposits	2,792	206
Accrued income taxes	461	426
Other	5,952	4,318
Total	$ 71,949	$ 76,600