Accrued Expenses Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Payables and Accruals [Abstract]
Payroll taxes	$ 1,786	$ 1,234
Payroll	2,075	3,708
Bonuses	2,736	2,387
Commissions	912	818
Vacation	4,362	3,792
Royalties	1,310	1,104
Value-Added Tax	1,018	874
Other Accrued Liabilities, Current	5,998	4,973
Total	$ 20,197	$ 18,890