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Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets [Abstract]    
Inventory differences $ 2,861 $ 2,521
Foreign tax credit and other foreign benefits 52,408 145,169
Stock-based compensation 6,327 11,470
Accrued expenses not deductible until paid 39,326 32,796
Foreign currency exchange 2,001 4,826
Net operating losses 5,230 9,584
Capitalized research and development 197 358
Other 211 1,063
Gross deferred tax assets 108,561 207,787
Deferred Tax Liabilities [Abstract]    
Foreign currency exchange 874 105
Foreign withholding taxes 29,018 0
Intangibles step-up 6,568 12,107
Overhead allocation to inventory 3,977 4,820
Amortization of intangibles 11,475 19,091
Foreign outside basis in controlled foreign corporation 0 106,846
Other 2,676 20,572
Gross deferred tax liabilities 54,588 163,541
Valuation allowance (56,906) (9,137)
Deferred taxes, net   $ 35,109
Deferred taxes, net (2,933)  
Foreign [Member]    
Operating Loss Carryforwards [Abstract]    
Operating loss carryforwards 17,100  
Operating loss carryforwards scheduled to expire 5,700  
Operating loss carryforwards that will not expire 11,400  
Valuation allowance on operating loss carryforwards 15,900  
Tax Credit Carryforwards [Abstract]    
Tax credit carryforward $ 52,000  
Foreign [Member] | Minimum [Member]    
Operating Loss Carryforwards [Abstract]    
Expiration date Dec. 31, 2018  
Tax Credit Carryforwards [Abstract]    
Expiration date Dec. 31, 2026  
Foreign [Member] | Maximum [Member]    
Operating Loss Carryforwards [Abstract]    
Expiration date Dec. 31, 2027  
Tax Credit Carryforwards [Abstract]    
Expiration date Dec. 31, 2027