Schedule II - Valuation And Qualifying Accounts And Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period	$ 5,343	$ 5,083	$ 5,186
Additions Charged to Costs And Expenses	90	260	0
Deductions And Net Write-Offs	(90)	0	(103)
Balance at End of Period	$ 5,343	$ 5,343	$ 5,083