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Business Segments - Schedule of Information on Company's Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 622,231 | $ 612,324 |
Operating income | 147,782 | 136,683 |
Interest expense | 10,921 | 11,000 |
Other (income) expense - net | (140) | (4,449) |
Income before income taxes | 137,001 | 130,132 |
Total assets | 3,551,460 |  | $ 3,473,857
Intersegment elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (1,740) | (257) |
Corporate office |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | (18,566) | (20,843) |
Total assets | 218,692 |  | 230,637
Fluid & Metering Technologies |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 242,336 | 232,261 |
Operating income | 71,866 | 66,166 |
Fluid & Metering Technologies | Intersegment elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 186 | 72 |
Fluid & Metering Technologies | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 242,522 | 232,333 |
Total assets | 1,140,025 |  | 1,107,777
Health & Science Technologies |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 224,688 | 220,967 |
Operating income | 54,154 | 51,806 |
Health & Science Technologies | Intersegment elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 602 | 108 |
Health & Science Technologies | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 225,290 | 221,075 |
Total assets | 1,372,517 |  | 1,329,368
Fire & Safety/Diversified Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 155,207 | 159,096 |
Operating income | 40,328 | 39,554 |
Fire & Safety/Diversified Products | Intersegment elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 952 | 77 |
Fire & Safety/Diversified Products | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 156,159 | $ 159,173 |
Total assets | $ 820,226 |  | $ 806,075

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