Preferred Stock, Common Stock and Other Stockholders' Equity (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (75,044)	$ (47,444)	$ (66,214)
Income tax expense (benefit)	47,601	(184,154)	(8,065)
Total reclassifications, net of tax	156,873	403,039	13,145
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	124	381
Reclassification out of Accumulated Other Comprehensive Income | Amortization of loss on interest rate hedge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(558)	(37)
Income tax expense (benefit)	219	15
Total reclassifications, net of tax	(339)	(22)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of deferred actuarial loss and prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses	761	666
Income tax expense (benefit)	(298)	(263)
Total reclassifications, net of tax	$ 463	$ 403