Stockholders' Equity (Other Comprehensive Income (Loss) Net of Tax) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (226,168,000)
Current period income	44,441,000
Reclassification adjustments, net of tax	(204,000)
Balance at end of period	(181,931,000)	(226,168,000)
Income tax benefits (losses) recorded in accumulated other comprehensive loss	(28,700,000)	20,500,000	24,200,000
Unrealized (Loss) Gain on Marketable Equity Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(4,072,000)
Current period income	1,710,000
Reclassification adjustments, net of tax	2,362,000
Balance at end of period	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	2,481,000
Current period income	56,000
Reclassification adjustments, net of tax	(2,566,000)
Balance at end of period	(29,000)
Change in Net Pension and Other Benefit Obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(224,577,000)
Current period income	42,675,000
Reclassification adjustments, net of tax	0
Balance at end of period	$ (181,902,000)