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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 |

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