Basis of Presentation Basis of Presentation (Changes in Allowance for Credit Losses and Sales Returns) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Allowance for credit losses [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4,011	[1]
Provision/adjustment	3,708
Write-off	554
Recovery	243
Balance at period end	7,408
Allowance for sales returns [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	1,518	[2]
Provision/adjustment	2,969
Deduction	2,870
Balance at period end	$ 1,617

[1] Upon adoption of ASU 2016-13 at January 1, 2020, we reclassified certain balances previously disclosed within the allowance for sales returns to the allowance for credit losses, as these amounts reflect the credit risk associated with our accounts receivable.

[2] As discussed above, we reclassified certain balances previously disclosed within the allowance for sales returns to the allowance for credit losses upon adoption of ASU 2016-13 at January 1, 2020.