Discontinued Operations Summary of Income Statement Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax			$ 68,000,000
Contract price			335,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(55,000)	2,963,000	70,585,000	5,529,000
Transaction expenses withheld from proceeds			5,390,000
Revenues	0	46,398,000	87,534,000	133,365,000
Gain on sale of Ecova (1)	0	0	161,100,000	0
Transaction expenses and accelerated employee benefits (2)			11,000,000
Gain on sale of Ecova, net of transaction expenses	(86,000)	0	152,038,000	0
Income (loss) before income taxes	(86,000)	5,540,000	156,513,000	10,999,000
Income tax expense (benefit)	(31,000)	2,092,000	85,741,000	4,178,000
Net income (loss) from discontinued operations	(55,000)	3,448,000	70,772,000	6,821,000
Net income attributable to noncontrolling interests	(20,000)	(518,000)	(213,000)	(1,351,000)
Ecova [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction expenses and accelerated employee benefits (2)	86,000	0	9,062,000	0
Net income attributable to noncontrolling interests	$ 0	$ (485,000)	$ (187,000)	$ (1,292,000)