Significant Accounting Policies (Schedule of Accounting Change) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues [Abstract]
Total revenue	$ 172,652												$ 557,240	$ 636,354	$ 691,545
Cost of Goods and Services Sold [Abstract]
Total cost of sales													333,865	355,813	367,151
Gross profit	72,449	$ 58,627	$ 35,167	$ 57,132	$ 74,256	$ 67,281	$ 73,299	$ 65,705	$ 82,553	$ 77,810	$ 86,162	$ 77,869	223,375	280,541	324,394
Operating Expenses [Abstract]
Selling, general and administrative													219,895	254,355	272,287
Research and development													74,143	83,290	95,298
Total operating expenses	71,718	126,231	69,039	75,350	78,955	79,215	92,465	87,010	89,572	88,794	93,884	95,335	342,338	337,645	367,585
Loss from operations	$ 731	$ (67,604)	$ (33,872)	$ (18,218)	$ (4,699)	$ (11,934)	$ (19,166)	$ (21,305)	$ (7,019)	$ (10,984)	$ (7,722)	$ (17,466)	(118,963)	(57,104)	(43,191)
As reported
Revenues [Abstract]
Total revenue														629,094	687,660
Cost of Goods and Services Sold [Abstract]
Total cost of sales														351,053	363,266
Gross profit														278,041	324,394
Operating Expenses [Abstract]
Selling, general and administrative														254,355	272,287
Research and development														80,790	95,298
Total operating expenses														335,145	367,585
Loss from operations														(57,104)	(43,191)
Change
Revenues [Abstract]
Total revenue													6,953	7,260	3,885
Cost of Goods and Services Sold [Abstract]
Total cost of sales														4,760	3,885
Gross profit														2,500	0
Operating Expenses [Abstract]
Selling, general and administrative														0	0
Research and development														2,500	0
Total operating expenses														2,500	0
Loss from operations														0	0
Products
Revenues [Abstract]
Total revenue													332,799	389,337	433,100
Cost of Goods and Services Sold [Abstract]
Total cost of sales													227,681	234,581	233,678
Products | As reported
Revenues [Abstract]
Total revenue														384,577	429,215
Cost of Goods and Services Sold [Abstract]
Total cost of sales														229,821	229,793
Products | Change
Revenues [Abstract]
Total revenue														4,760	3,885
Cost of Goods and Services Sold [Abstract]
Total cost of sales														4,760	3,885
Services
Revenues [Abstract]
Total revenue													224,441	247,017	258,445
Cost of Goods and Services Sold [Abstract]
Total cost of sales													$ 106,184	121,232	133,473
Services | As reported
Revenues [Abstract]
Total revenue														244,517	258,445
Cost of Goods and Services Sold [Abstract]
Total cost of sales														121,232	133,473
Services | Change
Revenues [Abstract]
Total revenue														2,500	0
Cost of Goods and Services Sold [Abstract]
Total cost of sales														$ 0	$ 0