| Revenues Gross Profit And Operating Income By Segment [Table Text Block] |
Revenues, gross profit, and operating income associated with our segments were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2014 | | 2013 | | 2012 | | (in thousands) | Revenues | | | | | | Electricity | $ | 794,144 |
| | $ | 836,553 |
| | $ | 1,024,340 |
| Gas | 599,081 |
| | 570,297 |
| | 627,193 |
| Water | 577,472 |
| | 541,878 |
| | 526,645 |
| Total Company | $ | 1,970,697 |
| | $ | 1,948,728 |
| | $ | 2,178,178 |
| | | | | | | Gross profit | | | | | | Electricity | $ | 208,476 |
| | $ | 218,913 |
| | $ | 295,005 |
| Gas | 211,815 |
| | 207,915 |
| | 235,391 |
| Water | 202,834 |
| | 187,705 |
| | 184,751 |
| Total Company | $ | 623,125 |
| | $ | 614,533 |
| | $ | 715,147 |
| | | | | | | Operating income (loss) | | | | | | Electricity | $ | (72,476 | ) | | $ | (235,908 | ) | | $ | 24,812 |
| Gas | 75,598 |
| | 83,882 |
| | 110,557 |
| Water | 71,006 |
| | 63,252 |
| | 59,210 |
| Corporate unallocated | (70,296 | ) | | (46,407 | ) | | (43,453 | ) | Total Company | 3,832 |
| | (135,181 | ) | | 151,126 |
| Total other income (expense) | (18,741 | ) | | (13,073 | ) | | (14,907 | ) | Income (loss) before income taxes | $ | (14,909 | ) | | $ | (148,254 | ) | | $ | 136,219 |
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| Revenues By Region [Table Text Block] |
Revenues by region were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2014 | | 2013 | | 2012 | | (in thousands) | United States and Canada | $ | 899,399 |
| | $ | 851,295 |
| | $ | 1,014,739 |
| Europe, Middle East, and Africa (EMEA) | 848,502 |
| | 858,026 |
| | 878,615 |
| Other | 222,796 |
| | 239,407 |
| | 284,824 |
| Total revenues | $ | 1,970,697 |
| | $ | 1,948,728 |
| | $ | 2,178,178 |
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| Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
Property, plant, and equipment, net, by geographic area were as follows: | | | | | | | | | | At December 31, | | 2014 | | 2013 | | (in thousands) | United States | $ | 76,130 |
| | $ | 87,954 |
| Outside United States | 131,659 |
| | 158,866 |
| Total property, plant, and equipment, net | $ | 207,789 |
| | $ | 246,820 |
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| Depreciation And Amortization Expense Associated With Segments [Table Text Block] |
Depreciation and amortization expense associated with our segments was as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2014 | | 2013 | | 2012 | | (in thousands) | Electricity | $ | 47,886 |
| | $ | 46,535 |
| | $ | 52,113 |
| Gas | 26,031 |
| | 27,266 |
| | 29,968 |
| Water | 24,259 |
| | 24,797 |
| | 27,324 |
| Corporate Unallocated | 287 |
| | 247 |
| | 66 |
| Total Company | $ | 98,463 |
| | $ | 98,845 |
| | $ | 109,471 |
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