Accrued Liabilities and Other Current Liabilities, and Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Accrued expenses	$ 29,764	$ 33,947
Compensation and payroll taxes	34,359	23,720
Equipment purchases	20,637	6,377
Accrued pricing adjustments	11,410	3,817
Accrued professional services	2,088	2,645
Other	1,043	1,056
Accrued Liabilities, Current, Total	99,301	71,562
Liabilities, Noncurrent [Abstract]
Accrued defined benefit plan	34,428	30,515
Unrecognized tax benefits	24,211	15,340
Deferred grant and subsidy	17,173	18,259
Income tax contingencies	8,319	8,163
Deferred compensation	8,870	6,433
Other	1,924	2,663
Other long-term liabilities, Total	$ 94,925	$ 81,373