Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Liabilities [Abstract]
Accrued salaries and benefits	$ 7,642	$ 6,029
Accrued Bonuses, Current	3,627	2,990
Accrued value added tax	1,114	2,322
Other Accrued Liabilities, Current	3,676	3,288
Accrued liabilities	$ 16,059	$ 14,629