Valuation And Qualifying Accounts (In Thousands) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable allowances
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Balance at Beginning of Period	$ 12,060	$ 9,533	$ 10,783
Additions	229,509	168,945	122,792
Deductions Charged to Reserves	(232,026)	(166,418)	(124,042)
Balance at End of Period	9,543	12,060	9,533
Rebates, fees and returns reserves
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Balance at Beginning of Period	100,702	89,466	45,162
Additions	270,959	255,471	186,941
Deductions Charged to Reserves	(294,891)	(244,235)	(142,637)
Balance at End of Period	76,770	100,702	89,466
Valuation allowance for deferred tax assets
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Balance at Beginning of Period	4,740	1,429	11,859
Additions	108,562	3,875	632
Deductions Charged to Reserves	(24)	(564)	(11,062)
Balance at End of Period	$ 113,278	$ 4,740	$ 1,429