Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Amounts reclassified out of each component of accumulated other comprehensive income (loss)
Interest expense	$ (63,544)	$ (30,545)	$ (169,291)	$ (89,716)
Other income (loss)	4,886	(943)	4,277	(13,855)
Loss from continuing operations before income tax benefit	(117,724)	(1,103,140)	(317,459)	(1,022,556)
Income tax expense (benefit)	17,000	41,184	132,799	27,972
Net loss	(100,724)	(1,061,956)	(184,660)	(989,404)
Gains and losses on cash flow hedges | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Amounts reclassified out of each component of accumulated other comprehensive income (loss)
Loss from continuing operations before income tax benefit			(2,640)
Income tax expense (benefit)			1,009
Net loss			(1,631)
Gains and losses on cash flow hedges | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Interest rate swaps
Amounts reclassified out of each component of accumulated other comprehensive income (loss)
Interest expense			(3,018)
Other income (loss)			378
Amortization of pension and postretirement benefit plans | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Amounts reclassified out of each component of accumulated other comprehensive income (loss)
Prior service cost			1,119
Net actuarial loss			21,484
Loss from continuing operations before income tax benefit			22,603
Income tax expense (benefit)			(8,627)
Net loss			13,976
Gains and losses on available-for-sale securities | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Amounts reclassified out of each component of accumulated other comprehensive income (loss)
Other income (loss)			(1,382)
Income tax expense (benefit)			529
Net loss			$ (853)