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Schedule II - Valuation and Qualifying Accoutns (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation Allowance of Deferred Tax Assets [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance Period Start $ 48,926 $ 37,015 $ 37,926
Additions Charged (Credited) to Costs and Expenses 3,700 6,356 (2,631)
Deductions 0 0 0
Other 230 [1] 5,555 [1] 1,720 [1]
Valuation Allowances and Reserves, Balance Period End 52,856 48,926 37,015
Allowance for Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation Allowances and Reserves, Balance Period Start 33,259 25,052 23,100
Additions Charged (Credited) to Costs and Expenses 7,597 15,112 7,984
Deductions (11,654) (6,905) (6,032)
Valuation Allowances and Reserves, Balance Period End $ 29,202 $ 33,259 $ 25,052
[1] Due to acquisitions.