Segment Information Information By Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 495,491	$ 504,063	$ 1,425,202	$ 1,654,843
Gross profit	150,084	171,797	449,795	551,647
Operating Income (Loss)	(6,488)	45,967	13,835	131,651
Total other income (expense)	(2,859)	(3,523)	(8,837)	(11,151)
Income Before Income Taxes	(9,347)	42,444	4,998	120,500
Energy Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	359,855	377,489	1,022,156	1,259,834
Gross profit	102,940	125,503	311,167	409,057
Operating Income (Loss)	(9,284)	30,978	5,960	116,211
Water Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	135,636	126,574	403,046	395,009
Gross profit	47,144	46,294	138,628	142,590
Operating Income (Loss)	17,225	22,293	45,189	49,896
Corporate Unallocated [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (14,429)	$ (7,304)	$ (37,314)	$ (34,456)