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Commitments and Contingencies (Warranty activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 7,200 |  | $ 7,200 |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties | 51 | $ 169 | (88) | $ 72 |
Accrued Expenses |  |  |  |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |  |
Warranty accrual, beginning of period | 4,851 | 2,898 | 3,840 | 2,980 |
Warranties issued | 1,137 | 930 | 2,992 | 2,351 |
Settlements | (638) | (639) | (1,343) | (2,045) |
Warranty accrual, end of period | 5,401 | $ 3,358 | 5,401 | $ 3,358 |
Performance Bonds |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |
Amount of performance bonds outstanding | $ 10,400 |  | $ 10,400 |  | $ 5,400

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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- Definition 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. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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