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Quarterly Results (Unaudited) Quarterly Results Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 550,776 | $ 486,747 | $ 503,082 | $ 477,592 | $ 495,713 | $ 506,859 | $ 513,024 | $ 497,590 |  | $ 2,018,197 | $ 2,013,186 | $ 1,883,533
Gross Profit | 174,751 | 165,318 | 177,860 | 157,225 | 156,663 | 170,749 | 169,705 | 163,203 |  | 675,154 | 660,320 | 556,685
Net Income (Loss) Attributable to Parent | $ 1,780 | $ 25,576 | $ 14,097 | $ 15,845 | $ 11,649 | $ (9,885) | $ 19,917 | $ 10,089 |  | $ 57,298 | $ 31,770 | $ 12,678
Earnings per common share - Basic | $ 0.05 | $ 0.66 | $ 0.36 | $ 0.41 | $ 0.30 | $ (0.26) | $ 0.52 | $ 0.27 |  | $ 1.48 | $ 0.83 | $ 0.33
Earnings per common share - Diluted | 0.05 | $ 0.65 | $ 0.36 | $ 0.40 | $ 0.30 | $ (0.26) | $ 0.52 | $ 0.26 |  | $ 1.45 | $ 0.82 | $ 0.33
Unusual or Infrequent Item, or Both, Insurance Proceeds |  |  | $ 8,000 |  |  |  |  |  |  | $ 8,000 |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  | 6,418 | $ 49,090 | $ (7,263)
Warranty Expense |  |  |  |  |  |  |  |  |  | (2,054) | 13,920 | 45,984
2016 Projects [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | $ 7,800 | $ 40,000 |  |  | $ 47,794 | 6,418 |  |
Water Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 461,634 | 505,336 | 519,422
Gross Profit |  |  |  |  |  |  |  |  |  | 164,898 | $ 172,580 | $ 145,680
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  | $ 13,061 | 700 |  |
Tax Cuts and Jobs Act [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  |  |  |  |  |  |  | $ 30,400 |  |
Earnings per common share - Basic | 0.79 |  |  |  |  |  |  |  |  |  |  |
Earnings per common share - Diluted | $ 0.77 |  |  |  |  |  |  |  |  |  |  |
Insurance Recovery, net of tax [Member] | Water Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share - Basic |  |  | $ 0.13 |  |  |  |  |  |  | $ 0.13 |  |
Earnings per common share - Diluted |  |  | $ 0.12 |  |  |  |  |  |  | $ 0.12 |  |

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