Schedule II - Valuation And Qualifying Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowance adjustment		$ 1,200,000		$ 3,300,000
Allowance For Doubtful Accounts And Sales Returns And Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	7,322,000	11,216,000		10,052,000
Charged to Costs and Expenses	1,118,000	(2,167,000)		2,645,000
Deductions	(1,462,000)	(1,727,000)		(1,481,000)
Balance at End of Period	6,978,000	7,322,000		11,216,000
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	36,634,000	36,131,000		35,968,000
Charged to Costs and Expenses	(4,111,000)	431,000		3,649,000
Charged to Other Accounts		1,160,000	[1]	(3,286,000)	[1]
Deductions	(219,000)	(1,088,000)		(200,000)
Balance at End of Period	$ 32,304,000	$ 36,634,000		$ 36,131,000

[1] In 2010, $1.2 million of deferred tax liability was reclassified to the valuation allowance with no impact to the consolidated statement of operations. In 2009, the balance was reduced by $3.3 million, which was no longer required as a result of the estimated expiration of the carryforward period of a net operating loss carryforward for which a deferred tax asset had been previously recorded.