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
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning	$ 11,536	$ 12,399	$ 11,965
Valuation Allowances and Reserves, Charged to Cost and Expense	1,811	1,031	2,135
Valuation Allowances and Reserves, Charged to Other Accounts	(227)	(50)	246
Valuation Allowances and Reserves, Deductions	803	1,844	1,947
Valuation Allowances and Reserves, Balance, Ending	12,317	11,536	12,399
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning	44,669	59,586	25,801
Valuation Allowances and Reserves, Charged to Cost and Expense	0	0	0
Valuation Allowances and Reserves, Charged to Other Accounts	912	5,342	37,546
Valuation Allowances and Reserves, Deductions	10,843	20,259	3,761
Valuation Allowances and Reserves, Balance, Ending	$ 34,738	$ 44,669	$ 59,586