Income Taxes Deferred income tax assets (liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets and liabilities [Line Items]
Non-current deferred tax asset	$ 68,666	$ 67,961
Deferred Tax Assets, Net	29,371	25,907
Non-current deferred tax asset, gross total [Member]
Deferred tax assets and liabilities [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	5,668	2,632
Noncurrent deferred tax asset - acquired future tax deductions	7,781	8,711
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	7,138	9,654
Deferred Tax Assets, Unrealized Currency Losses	2,406	2,716
Noncurrent deferred tax asset - tax credits state	12,444	11,331
Deferred Tax Assets, Inventory	8,493	4,305
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	4,460	4,242
Noncurrentdeferredtaxassetaccruedrestructuring	1,293	7,072
Noncurrentdeferredtaxassetchargebacksdiscountscustomerconcessions	22,874	20,975
Deferred Tax Assets, Valuation Allowance	3,891	3,677
Noncurrent deferred tax liability [Member]
Deferred tax assets and liabilities [Line Items]
Noncurrent deferred tax liability - state income taxes	2,398	2,600
Noncurrent deferred tax liability - foreign	776	997
Noncurrent deferred tax liability - depreciation and amortization	26,375	23,839
Deferred tax liability, change in accounting method	9,746	14,618
Deferred Tax Liabilities, Net	$ 39,295	$ 42,054