Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
(Increase) decrease to unrecognized tax benefits	$ (61,470,000)	$ (2,198,000)	$ (1,187,000)
Current tax benefits	(112,900,000)
Deferred tax benefit provision tooffset current tax benefit	26,200,000
Extraterritorial income exclusion	11,200,000
Significant Change In Unrecognized Tax Benefits Nature Of Event	2007 and 2008
Reversal of valuation allowance based upon change in judgement as to realization			(335,300,000)
Statute of limitations to expire during next twelve months	2007 and 2008
Potential change in unrecognized tax benefits is reasonably possible during next twelve months, amount of unrecorded benefit tax positions	1,600,000
Deferred income tax (provision) benefit	22,003,000	40,468,000	(328,226,000)
Liability for UTPs	80,700,000	139,900,000
Unrecognized tax benefits, interest on income taxes accrued	2,600,000
Unrecognized tax benefits, income tax penalties accrued	9,500,000
Unrecognized tax benefits that would reduce the income tax provision	36,100,000
Benefit from unrecognized tax benefits	86,700,000
Valuation allowance	7,108,000	10,887,000	11,200,000	414,000,000
Changes in valuation allowance	(3,800,000)	(300,000)	(402,800,000)
Change in valuation allowance	2,311,000	684,000	375,367,000
Deferred tax (provision) benefit for adjustments in other comprehensive loss	22,612,000	(39,416,000)	(22,300,000)
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	290,400,000
Operating loss carryforwards, limitations on use	32,600,000
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	73,400,000
Research Credit [Member]
Income Tax Contingency [Line Items]
Federal research credits	1,200,000
Other Tax Carryforward, AMT Tax Credits [Member]
Income Tax Contingency [Line Items]
Federal and State AMT credits carryforwards	2,700,000
Continuing Operations [Member]
Income Tax Contingency [Line Items]
Change in valuation allowance	2,300,000	700,000	375,400,000
Discontinued Operations [Member]
Income Tax Contingency [Line Items]
Changes in valuation allowance	$ (1,500,000)	$ 400,000	$ (27,400,000)