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Quarterly Results (Unaudited) Quarterly Results Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 495,713 | $ 506,859 | $ 513,024 | $ 497,590 |  |  | $ 496,448 | $ 469,528 | $ 470,811 | $ 446,746 | $ 2,013,186 | $ 1,883,533 | $ 1,947,616
Gross Profit | 156,663 | 170,749 | 169,705 | 163,203 |  |  | 152,419 | 147,290 | 118,554 | 138,422 | 660,320 | 556,685 | 614,050
Net Income (Loss) Attributable to Parent | $ 11,649 | $ (9,885) | $ 19,917 | $ 10,089 |  |  | $ 8,986 | $ 12,640 | $ (14,346) | $ 5,398 | $ 31,770 | $ 12,678 | $ (23,670)
Earnings (loss) per common share - Basic | $ 0.30 | $ (0.26) | $ 0.52 | $ 0.27 |  |  | $ 0.23 | $ 0.33 | $ (0.37) | $ 0.14 | $ 0.83 | $ 0.33 | $ (0.60)
Earnings (loss) per common share - Diluted | $ 0.30 | $ (0.26) | $ 0.52 | $ 0.26 |  |  | $ 0.23 | $ 0.33 | $ (0.37) | $ 0.14 | $ 0.82 | $ 0.33 | $ (0.60)
Restructuring Charges |  |  |  |  |  |  |  |  |  |  | $ 49,090 | $ (7,263) | $ 49,482
Quarterly Financial Information, Quarterly Charges and Credits, Amount Affecting Comparability |  |  |  |  | $ 13,300 |  |  |  |  |  |  |  |
Warranty Expense |  |  |  |  |  |  |  |  |  |  | 13,920 | 45,984 | 9,238
2016 Projects [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges | $ 7,800 | $ 40,000 |  |  |  |  |  |  |  |  | 47,794 |  |
Water Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 505,336 | 519,422 | 576,668
Gross Profit |  |  |  |  |  |  |  |  |  |  | 172,580 | $ 145,680 | $ 202,178
Warranty Expense |  |  |  |  |  | $ 23,600 |  |  |  |  |  |  |
Water Operating Segment [Member] | 2016 Projects [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  | $ 13,061 |  |

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