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Segment Results Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 $ / shares | Sep. 30, 2016 $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 $ / shares
Segment Reporting [Abstract] |  |  |  |
Number of Reportable Segments | 3 | 3 | 3 | 3
Segment Reporting Information [Line Items] |  |  |  |
Concentration Risk, Supplier |  |  | We currently buy a majority of our integrated circuit boards, an important component in our products, from two suppliers. Management believes that other suppliers could provide similar circuit boards, but a change in suppliers, disputes with our suppliers, or unexpected constraints on the suppliers’ production capacity could adversely affect operating results. |
Unusual or Infrequent Item, or Both, Insurance Proceeds | $ |  |  | $ 8.0 |
Earnings (loss) per common share - Basic | $ 0.66 | $ (0.26) | $ 1.44 | $ 0.53
Earnings (loss) per common share - Diluted | $ 0.65 | $ (0.26) | $ 1.41 | $ 0.52
Gross Profit [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unusual or Infrequent Item, or Both, Insurance Proceeds | $ |  |  | $ 8.0 |
Water Operating Segment [Member] | Insurance Recovery, net of tax [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings (loss) per common share - Basic |  |  | $ 0.13 |
Earnings (loss) per common share - Diluted |  |  | $ 0.12 |

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- Definition Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84177960&loc=d3e7102-108593 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 + Details
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