Commitments and Contingencies (Schedule of Changes in Warranty Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of beginning of the period	$ 14,412	$ 44,068	$ 42,571
Reclassified to sales returns upon adoption of ASC 606	0	(29,147)	0
Provision for warranty liability made during the period	7,050	12,783	91,384
Settlements made during the period	(10,906)	(13,292)	(89,887)
Balance at end of period	10,556	14,412	$ 44,068
Sales returns	$ 52,612	$ 46,318
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Movement in Standard Product Warranty Accrual [Roll Forward]
Sales returns				$ 29,100