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Segment Information - By Segment (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 25, 2015 USD ($) | Sep. 26, 2014 USD ($) | Sep. 25, 2015 USD ($) segment | Sep. 26, 2014 USD ($) | Dec. 26, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Net Sales | $ 318,986 | $ 302,614 | $ 960,928 | $ 915,125 |
Operating Earnings | 76,927 | 78,907 | 226,049 | 239,460 |
Assets | 1,387,399 |  | 1,387,399 |  | $ 1,544,778
Operating Segments | Industrial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 152,164 | 150,481 | 448,932 | 459,105 |
Operating Earnings | 50,822 | 49,167 | 144,500 | 149,164 |
Assets | 557,592 |  | 557,592 |  | 548,868
Operating Segments | Process |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 64,710 | 52,719 | 204,337 | 160,579 |
Operating Earnings | 10,437 | 12,161 | 34,923 | 38,376 |
Assets | 483,788 |  | 483,788 |  | 304,903
Operating Segments | Contractor |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 102,112 | 99,414 | 307,659 | 295,441 |
Operating Earnings | 24,135 | 23,358 | 70,550 | 69,897 |
Assets | 210,707 |  | 210,707 |  | 176,757
Unallocated corporate (expense) |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Earnings | (8,467) | $ (5,779) | (23,924) | $ (17,977) |
Assets | $ 135,312 |  | $ 135,312 |  | $ 514,250

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