Organization and Summary of Significant Accounting Policies Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 6,182	$ 3,897	$ 4,050
Bad debt expense	2,768	4,164	916
Write-offs, net of recoveries	(3,478)	(1,879)	(1,069)
Balance at end of year	5,472	6,182	3,897
SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	7,726	6,264	6,531
Provision for inventory write-downs	3,656	3,998	2,660
Deductions for inventory write-offs	(2,346)	(2,536)	(2,927)
Balance at end of year	$ 9,036	$ 7,726	$ 6,264