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Restructuring and Asset Impairment - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) positions facility | Dec. 31, 2018 USD ($) facility position
Restructuring Cost and Reserve [Line Items] |  |  |
Expected future charges associated with previous restructuring on earnings | $ 5,100 |  |
Number of facilities closed (facility) | facility |  | 5 |
Net book value of fixed assets sold | $ 1,224,143 | $ 1,233,821 | [1],[2]
2019 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of eliminated positions (position) | positions | 90 |  |
Asset impairment/disposal of assets | $ 6,389 |  |
Proceeds from the sale of fixed assets and inventory | 3,377 |  |
2019 Actions | Other Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment/disposal of assets | 599 |  |
Proceeds from the sale of fixed assets and inventory | $ 212 |  |
2018 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of facilities closed (facility) | facility | 5 |  |
Number of eliminated positions (position) | position |  | 120 |
Asset impairment/disposal of assets | $ 4,046 |  |
Proceeds from the sale of fixed assets and inventory | $ 3,516 |  |
2018 Actions | Alabama |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of facilities closed (facility) | facility | 1 |  |
2018 Actions | Canada |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of facilities closed (facility) | facility |  | 1 |
2018 Actions | Indonesia |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of facilities closed (facility) | facility |  | 1 |
2018 Actions | Russia |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of facilities closed (facility) | facility |  | 1 |
2018 Actions | Norway |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of facilities closed (facility) | facility |  | 1 |
2018 Actions | Sale of Fixed Assets and Inventory | Indonesia |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment/disposal of assets |  | $ 232 |
Proceeds from the sale of fixed assets and inventory |  | 416 |
Net book value of fixed assets sold |  | 648 |
Asset write off |  | 909 |
2018 Actions | Other Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment/disposal of assets | $ 1,915 |  |
Proceeds from the sale of fixed assets and inventory | 1,977 |  |
2017 and earlier Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected future charges associated with previous restructuring on earnings | (100) |  |
Restructuring reserve | $ 1,653 | $ 4,199 |
[1] | The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.
[2] | The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.

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