Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]
Decrease in valuation allowance			$ 1,157,111
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	3,857	4,693	3,971
Charged to Costs and Expenses	10,707	658	1,094
Recoveries	2		2
Write offs	9,298	1,494	374
Other deductions	597
Balance at End of Period	4,671	3,857	4,693
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	109,181	109,181	1,835,161
Charged to Costs and Expenses
Recoveries
Other additions
Write offs
Other deductions			1,725,980	[1]
Balance at End of Period	$ 109,181	$ 109,181	$ 109,181

[1] During 2010, the Company's revised projections of future taxable income enabled it to conclude that it was more likely than not that it will have future taxable income sufficient to realize a significant portion of the Company's net deferred tax asset; accordingly, $1,157,111,000 of the deferred tax valuation allowance was reversed as a credit to income tax expense.