Accrued Liabilities and Other Current Liabilities, and Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities, Current [Abstract]
Accrued expenses	$ 60,322	$ 30,761
Compensation and payroll taxes	48,748	34,043
Equipment purchases	7,297	10,167
Operating lease	10,663	12,554
Finance lease	149	903
Accrued pricing adjustments	7,891	5,617
Accrued professional services	3,708	3,258
Tax payable - non-income tax related	7,858	2,972
Other	13,481	296
Accrued Liabilities, Current, Total	160,117	100,571
Liabilities, Noncurrent [Abstract]
Accrued defined benefit plan	35,316	28,795
Unrecognized tax benefits	27,965	28,215
Operating lease	27,041	27,545
Finance lease	24	138
Deferred grants and subsidy	11,924	12,774
Deferred compensation	14,833	12,166
Tax contingencies	8,787	8,631
Other	4,905	2,281
Other long-term liabilities, Total	$ 130,795	$ 120,545