Discontinued Operations - Results of discontinued operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Discontinued Operations and Disposal Groups [Abstract]
Operating Revenues	$ 7	$ 72,308	$ 2,016	$ 146,359
Operating Expenses	(161)	65,650	2,546	139,095
Asset Impairment Charge		45,573		45,573
Operating Income (Loss)	168	(38,915)	(530)	(38,309)
Interest Charges		5		174
Other Income	160	97	572	230
Income Tax Expense (Benefit)	131	(15,021)	(74)	(14,608)
Net Income (Loss) from Operations	197	(23,802)	116	(23,645)
(Loss) Gain on Disposition Before Taxes		(490)	216	(3,713)
Income Tax Expense (Benefit) on Disposition	0	(35)	6	(169)
Net (Loss) Gain on Disposition		(455)	210	(3,544)
Net Income (Loss)	$ 197	$ (24,257)	$ 326	$ (27,189)