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Schedule II - Valuation And Qualifying Accounts and Reserves (Details) (Allowance For Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance For Doubtful Accounts [Member]
      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance $ 3,970 $ 4,506 $ 4,069
Additions Charged to Costs and Expenses 1,990 2,160 2,450
Additions Charged to Other Accounts 0 0 0
Deductions 2,041 [1] 2,696 [1] 2,013
Ending Balance $ 3,919 $ 3,970 $ 4,506
[1] Represents write-offs