Schedule II (Details) (Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 8,946		$ 8,120		$ 8,321
Charged to Cost and Expenses	5		90		227
Deductions	(5)		(168)		(902)
Other	783	[1]	904	[1]	474	[1]
Balance at End of Period	$ 9,729		$ 8,946		$ 8,120

[1] *Other represents doubtful account reserves recorded as part of net revenues for estimated customer disallowances.