SCHEDULE II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for doubtful accounts
Allowance for valuation and qualifying accounts
Balance at Beginning of Period	$ 2,175	$ 2,140	$ 6,465
Charged to Costs and Expenses	906	398	2,074
Other	2,651		(3,921)
Deductions	(950)	(363)	(2,478)
Balance at End of Period	4,782	2,175	2,140
Tax-Related valuation allowance
Allowance for valuation and qualifying accounts
Balance at Beginning of Period	234,813	95,151	45,690
Charged to Costs and Expenses	1,483	152,472	49,462
Other		(12,811)
Balance at End of Period	$ 236,296	$ 234,813	$ 95,151