Discontinued Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Summary of the discontinued operations activity
Operating revenues		$ 56,573,000		$ 210,619,000
Income from discontinued operations before income taxes	3,258,000	9,384,000	3,077,000	63,590,000
Income tax expense	1,382,000	3,825,000	1,305,000	22,990,000
Income from discontinued operations, net of tax	1,876,000	5,559,000	1,772,000	40,600,000
Equitable Gas and Homeworks
Discontinued operations
Additional cash proceeds as a result of post-closing purchase price adjustments	7,400,000
Cash proceeds received	748,000,000
Additional gain on sale of business	3,600,000		3,600,000
Fair value of assets	140,300,000		140,300,000
Fair value of other contractual assets	$ 32,500,000		$ 32,500,000