Segment Information Information By Segment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 2,178,178	$ 2,434,124	$ 2,259,271
Gross profit	715,147	746,458	700,675
Operating income (loss)	151,126	(459,183)	184,197
Total other income (expense)	(14,907)	(42,583)	(59,752)
Income (loss) before income taxes	136,219	(501,766)	124,445
Depreciation and amortization	109,471	129,466	131,205
Goodwill, Impairment Loss	0	584,847	0
Energy Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,651,533	1,912,427	1,801,342
Gross profit	530,396	578,575	541,900
Operating income (loss)	135,369	(112,831)	184,163
Depreciation and amortization	82,081	97,135	97,827
Goodwill, Impairment Loss		254,735
Water Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	526,645	521,697	457,929
Gross profit	184,751	167,883	158,775
Operating income (loss)	59,210	(303,772)	43,611
Depreciation and amortization	27,324	32,313	33,376
Goodwill, Impairment Loss		330,112
Corporate Unallocated [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(43,453)	(42,580)	(43,577)
Depreciation and amortization	$ 66	$ 18	$ 2