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Acquisitions - Acquisition of NII (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 05, 2017 USD ($) facility | Nov. 08, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire businesses |  |  |  | $ 204,228,000 | $ 56,617,000 |
Goodwill |  |  | $ 264,840,000 | $ 264,840,000 |  | $ 151,455,000
NII FPG [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire businesses | $ 170,655,000 |  |  |  |  |
Post-closing Adjustment | (2,134,000) |  |  |  |  |
Cash Paid to Seller Borrowed Under the Revolving Credit Facility | $ 170,018,000 |  |  |  |  |
Number of primary manufacturing facilities | facility | 2 |  |  |  |  |
Revenues reported by acquired entity |  |  |  |  |  | $ 81,000,000
Goodwill | $ 84,606,000 |  |  |  |  |
Goodwill expected to be deductible for tax purposes | 32,990,000 |  |  |  |  |
Revenues from the date of acquisition |  |  | 26,668,000 |  |  |
Total operating income |  |  | 1,124,000 |  |  |
Amortization expense |  |  | 4,212,000 |  |  |
NII FPG [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash Paid to Seller Borrowed Under the Revolving Credit Facility | $ 170,018,000 |  |  |  |  |
NII FPG [Member] | Revolving Credit Facility [Member] | Canadian-Denominated Borrowing [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash Paid to Seller Borrowed Under the Revolving Credit Facility |  |  | 62,690,000 |  |  |
NII FPG [Member] | Revolving Credit Facility [Member] | Euro-Denominated Borrowing [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash Paid to Seller Borrowed Under the Revolving Credit Facility |  |  | $ 61,769,000 |  |  |
NII FPG [Member] | Subsequent Event [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Post-closing Adjustment |  | $ (2,134,000) |  |  |  |

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