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Commitments and Contingencies (Warranty activity) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Letters of Credit Outstanding, Amount	$ 7,000		$ 7,000		$ 9,800
Movement in Standard Product Warranty Accrual [Roll Forward]
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties	23	$ (52)	62	$ (139)
Accrued Expenses
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty accrual, beginning of period	6,861	4,173	6,407	3,840
Warranties issued	1,662	1,015	2,762	1,855
Settlements	(644)	(285)	(1,329)	(705)
Warranty accrual, end of period	$ 7,902	$ 4,851	$ 7,902	$ 4,851

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249

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Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(2))
-URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249

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Amount of increase (decrease) in the standard product warranty accrual from changes in estimates attributable to preexisting product warranties. Excludes extended product warranties.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249

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Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 8
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