Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets [Abstract]
Inventory differences	$ 4,257	$ 2,861
Foreign tax credit and other foreign benefits	62,521	52,408
Stock-based compensation	7,893	6,327
Accrued expenses not deductible until paid	40,509	39,326
Foreign currency exchange	1,023	2,001
Net operating losses	4,522	5,230
Capitalized research and development	11,988	197
Interest expense limitation - 163(j)	847	0
R&D credit carryforward	807	0
Other	339	211
Gross deferred tax assets	134,706	108,561
Deferred Tax Liabilities [Abstract]
Foreign currency exchange	124	874
Foreign withholding taxes	21,524	29,018
Intangibles step-up	5,763	6,568
Overhead allocation to inventory	2,857	3,977
Amortization of intangibles	15,812	11,475
Foreign outside basis in controlled foreign corporation	0	0
Other	833	2,676
Gross deferred tax liabilities	46,913	54,588
Valuation allowance	(68,697)	(56,906)
Deferred taxes, net	19,096
Deferred taxes, net		$ (2,933)
Tax Credit Carryforwards [Abstract]
Valuation allowance on foreign tax credit carryforward, interest expense limitation, and R&D credit carryforward	$ 64,300
Minimum [Member]
Tax Credit Carryforwards [Abstract]
Expiration date	Dec. 31, 2026
Maximum [Member]
Tax Credit Carryforwards [Abstract]
Expiration date	Dec. 31, 2028
Foreign [Member]
Operating Loss Carryforwards [Abstract]
Operating loss carryforwards	$ 14,800
Operating loss carryforwards scheduled to expire	4,400
Operating loss carryforwards that will not expire	10,400
Valuation allowance on operating loss carryforwards	$ 14,800
Foreign [Member] | Minimum [Member]
Operating Loss Carryforwards [Abstract]
Expiration date	Dec. 31, 2019
Foreign [Member] | Maximum [Member]
Operating Loss Carryforwards [Abstract]
Expiration date	Dec. 31, 2028