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Schedule of Valuation and Qualifying Accounts (Details) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 2,880 $ 3,297 $ 3,917
Charged (Credited) to Expenses or Other Accounts, Net 135 0 368
Deductions and Adjustments (266) [1] (417) [1] (988) [1]
Balance at End of Year $ 2,749 $ 2,880 $ 3,297
[1] Deductions and adjustments for the allowances primarily relate to accounts written off.