Accrued Liabilities and Other Current Liabilities, and Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Accrued expenses	$ 33,733	$ 28,170
Compensation and payroll taxes	34,043	33,632
Equipment purchases	10,167	12,568
Operating lease	12,554
Finance lease	903
Accrued pricing adjustments	5,617	3,591
Accrued professional services	3,258	3,242
Other	296	1,402
Accrued Liabilities, Current, Total	100,571	82,605
Liabilities, Noncurrent [Abstract]
Accrued defined benefit plan	28,795	26,349
Unrecognized tax benefits	28,215	27,711
Operating lease	27,545
Finance lease	138
Deferred grans and subsidy	12,774	15,359
Deferred compensation	12,166	9,091
Tax contingencies	8,631	8,475
Other	2,281	3,794
Other long-term liabilities, Total	$ 120,545	$ 90,779