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Acquisitions (Narratives) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 15, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 92,000 |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ 204,772 | $ 207,702 | $ 208,533 | $ 207,333 | $ 216,989 | $ 223,772 | $ 221,245 | $ 234,171 | $ 828,341 | $ 896,177 | $ 951,826
Net income from continuing operations |  |  |  |  |  |  |  |  |  | $ 24,466 | $ (32,135) | $ 36,029

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