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Acquisition - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2018 USD ($) Employee t | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 153,463,000 |  |  |  | $ 82,744,000 |  |  |  | $ 153,463,000 | $ 82,744,000 |
Intangible assets, net |  | 93,614,000 |  |  |  | 58,859,000 |  |  |  | 93,614,000 | 58,859,000 |
Net sales |  | 229,480,000 | $ 209,855,000 | $ 215,742,000 | $ 211,209,000 | $ 209,327,000 | $ 210,120,000 | $ 195,974,000 | $ 184,941,000 | 866,286,000 | 800,362,000 | $ 761,216,000
Operating income |  |  |  |  |  |  |  |  |  | 21,942,000 | 33,252,000 | (21,520,000)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 111,721,000 | $ 110,534,000 | $ 153,153,000
G P Business [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition purchase price | $ 186,000,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition, date of completion | Oct. 01, 2018 |  |  |  |  |  |  |  |  |  |  |
Annual production capacity | t | 32,000 |  |  |  |  |  |  |  |  |  |  |
Number of employees at manufacturing facility | Employee | 220 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 75,317,000 |  |  |  |  |  |  |  | 75,317,000 |  |
Intangible assets, net |  | 43,600,000 |  |  |  |  |  |  |  | 43,600,000 |  |
Goodwill deductible for tax purposes |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |
Acquired intangible assets estimated remaining life |  |  |  |  |  |  |  |  |  | 13 years |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 23,100,000 |  |
Operating income |  |  |  |  |  |  |  |  |  | 2,400,000 |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | $ 5,100,000 |  |
G P Business [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired property, plant and equipment, estimated remaining lives |  |  |  |  |  |  |  |  |  | 5 years |  |
G P Business [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired property, plant and equipment, estimated remaining lives |  |  |  |  |  |  |  |  |  | 25 years |  |

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