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Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Lessee, Lease, Description [Line Items] |  |
Amount of Lease-related assets and liabilities pre-tax reduction to retained earnings | $ 300 |
Lease expense | $ 2,258 | $ 2,100
Terminate lease | 1 year |
Increase in gross cash outflows when control of additional manufacturing space commences during the fourth quarter of 2019 | $ 6,100 |
2019 | 4,600 |
2020 | 3,200 |
2021 | 2,100 |
2022 | 1,500 |
2023 and thereafter | 6,500 |
Salt Lake City, Utah [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Property, plant, and equipment, net value | 17,300 |
Gross cost | 20,800 |
Accumulated depreciation | $ 3,500 |
Minimum [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Remaining lease term | 1 year |
Maximum [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Remaining lease term | 11 years |
Lease renewal term | 10 years |

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- Definition Remaining lease term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before depreciation of leased long-lived, physical assets used to produce goods and services and not intended for resale meeting the criteria for capitalization, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77904769&loc=SL2265659-115463 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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