Summary of Significant Accounting Policies and Other Matters 2 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Abstract]
Beginning balance	$ 3,321	$ 1,874	$ 6,003
Additions: charged to cost and expenses	8,089	8,681	8,601
Deductions: write-off of uncollectible accounts	(10,663)	(8,230)	(14,505)
Other	1,578	996	1,775
Ending balance	$ 2,325	$ 3,321	$ 1,874