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Restructuring (Narrative) (Details) $ in Thousands | 3 Months Ended | 27 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expense | $ 400 |  | $ 12,100
Number of positions eliminated to date | 50 |  | 50
Severance and outplacement costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expense |  | $ 8,100 |
AEC assets [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expense | $ 100 | $ 200 |

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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