Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets [Abstract]
Inventory differences	$ 5,040	$ 4,257
Foreign tax credit and other foreign benefits	69,820	62,521
Stock-based compensation	7,441	7,893
Accrued expenses not deductible until paid	35,374	40,509
Foreign currency exchange	163	1,023
Net operating losses	6,341	4,522
Capitalized research and development	18,716	11,988
Interest expense limitation - 163(j)	0	847
R&D credit carryforward	881	807
Other	37	339
Gross deferred tax assets	143,813	134,706
Deferred Tax Liabilities [Abstract]
Foreign currency exchange	721	124
Foreign withholding taxes	20,986	21,524
Intangibles step-up	4,958	5,763
Overhead allocation to inventory	3,611	2,857
Amortization of intangibles	15,393	15,812
Other	1,063	833
Gross deferred tax liabilities	46,732	46,913
Valuation allowance	(77,042)	(68,697)
Deferred taxes, net	20,039	$ 19,096
Tax Credit Carryforwards [Abstract]
Valuation allowance on foreign tax credit carryforward, interest expense limitation, and R&D credit carryforward	$ 70,700
Minimum [Member]
Tax Credit Carryforwards [Abstract]
Expiration date	Dec. 31, 2026
Maximum [Member]
Tax Credit Carryforwards [Abstract]
Expiration date	Dec. 31, 2029
Foreign [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards	$ 18,200
Operating loss carryforwards scheduled to expire	6,300
Operating loss carryforwards that will not expire	11,900
Valuation allowance on operating loss carryforwards	$ 18,200
Foreign [Member] | Minimum [Member]
Operating Loss Carryforwards [Abstract]
Expiration date	Dec. 31, 2020
Foreign [Member] | Maximum [Member]
Operating Loss Carryforwards [Abstract]
Expiration date	Dec. 31, 2029