Segment Information Information By Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenue, Net	$ 504,063	$ 615,555	$ 1,654,843	$ 1,791,647
Gross profit	171,797	176,996	551,647	553,925
Operating Income (Loss)	45,967	(497,252)	131,651	(399,078)
Total other income (expense)	(3,523)	(12,043)	(11,151)	(38,041)
Income Before Income Taxes	42,444	(509,295)	120,500	(437,119)
Depreciation and amortization	27,585	32,620	81,856	96,919
Energy Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Net	377,489	483,748	1,259,834	1,389,979
Gross profit	125,503	144,120	409,057	426,457
Operating Income (Loss)	30,978	(166,197)	116,211	(77,566)
Depreciation and amortization	20,452	24,246	61,596	72,169
Water Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Net	126,574	131,807	395,009	401,668
Gross profit	46,294	32,876	142,590	127,468
Operating Income (Loss)	22,293	(321,191)	49,896	(290,582)
Depreciation and amortization	7,116	8,368	20,211	24,742
Corporate Unallocated [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(7,304)	(9,864)	(34,456)	(30,930)
Depreciation and amortization	$ 17	$ 6	$ 49	$ 8