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
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 13,642	$ 13,228	$ 13,131
Additions Charged to Costs and Expenses	778	885	145
Deductions From Reserves	11,711	471	48
Balance at End of Year	$ 2,709	$ 13,642	$ 13,228