Schedule II - Valuation and Qualifying Accounts (Details) (Valuation Allowance of Deferred Tax Assets [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 214,269	$ 223,612	$ 208,925	$ 261,613
Valuation Allowances and Reserves, Charged to Cost and Expense	(509)	15,009	(28,056)
Valuation Allowances and Reserves, Deductions	(8,163)	(5)	(25,666)
Valuation Allowances and Reserves, Charged to Other Accounts	$ (671)	$ (317)	$ 1,034