Accounts Receivable, Sales and Allowances - Accrued liabilities for customer deductions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accrued liabilities
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 58,445	$ 57,451
Provision	16,160	39,074
Charges processed	(36,281)	(38,080)
Balance at end of period	38,324	58,445
Product returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Adjustments during the period	25,300
Product returns | Accrued liabilities
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	48,464	43,299
Provision	(3,932)	20,492
Charges processed	(11,075)	(15,327)
Balance at end of period	33,457	48,464
Government And Managed Care Rebates [Member] | Accrued liabilities
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	9,981	14,152
Provision	20,092	18,582
Charges processed	(25,206)	(22,753)
Balance at end of period	$ 4,867	$ 9,981