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Restructuring Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring | $ 12,490 | $ 7,753 | $ 12,490 | $ 7,753 | $ 7,800 |  | $ 8,800 |
Restructuring Reserve | 12,000 |  | 12,000 |  | 12,490 |  |  |
Resource Rationalizations |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  | $ 8,159 |  |
Restructuring Reserve | 7 |  | 7 |  | 317 | 1,791 |  |
Manchester Facility |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  | 8,796 |
Asset impairment charges |  |  |  |  |  |  | 5,629 |
Restructuring Reserve | 108 |  | 108 |  | 200 | 641 | 3,167 | $ 2,000
Workforce Reduction |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | 9,194 |  | 9,194 |  | 9,684 |  |  |
Workforce Reduction | Resource Rationalizations |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  | 6,190 |  |
Restructuring Reserve | 0 |  | 0 |  | 0 | 393 |  |
Onerous Lease |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Reserve | 2,806 |  | 2,806 |  | 2,806 |  |  |
Onerous Lease | Resource Rationalizations |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  | 1,969 |  |
Restructuring Reserve | 7 |  | 7 |  | 317 | 1,398 |  |
Onerous Lease | Manchester Facility |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  | 3,167 |
Asset impairment charges |  |  |  |  |  |  | 0 |
Restructuring Reserve | 108 |  | 108 |  | 200 | 641 | 3,167 | 2,000
Asset Impairment | Manchester Facility |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  | 5,629 |
Asset impairment charges |  |  |  |  |  |  | 5,629 |
Restructuring Reserve | 0 |  | 0 |  | $ 0 | $ 0 | $ 0 | $ 0
Other Current Liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring reserve, current | 13,100 |  | 13,100 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring reserve, noncurrent | $ 1,100 |  | $ 1,100 |  |  |  |  |

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