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Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Lessee, Lease, Description [Line Items] |  |  |
Finance lease obligation | $ 4,852 | $ 5,049 |
Finance lease right-of-use assets | 6,534 | 6,750 |
Operating lease right-of-use assets | 6,235 | 0 |
Operating lease, liability | 6,252 | 0 |
Germany |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Finance lease obligation | 4,800 | 5,000 |
Finance lease right-of-use assets | 6,500 | 6,700 |
Finance lease, right-of-use asset, amortization | 3,600 | $ 3,500 |
Accounting Standards Update 2016-02 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease right-of-use assets | 700 |  | $ 6,200
Operating lease, liability | 700 |  | $ 6,200
Scenario, Adjustment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease right-of-use assets | 6,900 |  |
Operating lease, liability | $ 6,900 |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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