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Segment Information Segment Results Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Segment Reporting Information [Line Items]                      
Gross Profit | $ $ 156,663 $ 170,749 $ 169,705 $ 163,203 $ 152,419 $ 147,290 $ 118,554 $ 138,422 $ 660,320 $ 556,685 $ 614,050
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)
Number of Operating Segments                 3 3 3
Water Operating Segment [Member]                      
Segment Reporting Information [Line Items]                      
Gross Profit | $                 $ 172,580 $ 145,680 $ 202,178
Electricity Operating Segment [Member]                      
Segment Reporting Information [Line Items]                      
Gross Profit | $                 $ 282,677 225,446 200,249
Customers purchasing certain communication modules manufactured between July 2013 and December 2014 [Domain] | Water Operating Segment [Member] | Warranty Obligations [Member]                      
Segment Reporting Information [Line Items]                      
Warranty charge | $                   $ 29,400  
Earnings (loss) per common share - Basic                   $ (0.47)  
Earnings (loss) per common share - Diluted                   $ (0.47)  
OpenWay project in North America [Member] | Electricity Operating Segment [Member] | Contracts Accounted for under Percentage of Completion [Member]                      
Segment Reporting Information [Line Items]                      
Gross Profit | $                     $ 15,900
Earnings (loss) per common share - Basic                     $ (0.25)
Earnings (loss) per common share - Diluted                     $ (0.25)
Sales [Member] | Customer A [Member] | Electricity Operating Segment [Member]                      
Segment Reporting Information [Line Items]                      
Percentage of total company revenue represented by one customer                 12.00%    
Sales [Member] | Customer B [Member] | Electricity Operating Segment [Member]                      
Segment Reporting Information [Line Items]                      
Percentage of total company revenue represented by one customer                 10.00%