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Segment Results Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting [Abstract] |  |  |  |
Number of Reportable Segments | 3 | 3 | 3 | 3
Segment Reporting Information [Line Items] |  |  |  |
Unusual or Infrequent Item, or Both, Insurance Proceeds | $ 8.0 |  | $ 8.0 |
Earnings per common share - Basic | $ 0.36 | $ 0.52 | $ 0.78 | $ 0.79
Earnings per common share - Diluted | $ 0.36 | $ 0.52 | $ 0.76 | $ 0.78
Revenue [Member] | Threshold for Reporting Customer Concentration [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration Risk, Percentage | 10.00% | 10.00% | 10.00% | 10.00%
Gross Profit [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unusual or Infrequent Item, or Both, Insurance Proceeds | $ 8.0 |  | $ 8.0 |
Water Operating Segment [Member] | Insurance Recovery, net of tax [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings per common share - Basic | $ 0.13 |  | $ 0.13 |
Earnings per common share - Diluted | $ 0.12 |  | $ 0.13 |

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