Annual report pursuant to Section 13 and 15(d)

Receivables and Allowance for Doubtful Receivables (Receivables by Type) (Details)

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Receivables and Allowance for Doubtful Receivables (Receivables by Type) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Notes And Loans Receivable [Line Items]    
Receivables $ 150,436 $ 141,827
Trade Accounts Receivable [Member]
   
Accounts Notes And Loans Receivable [Line Items]    
Receivables 148,902 140,533
Employee Receivable [Member]
   
Accounts Notes And Loans Receivable [Line Items]    
Receivables 703 720
Other Receivable [Member]
   
Accounts Notes And Loans Receivable [Line Items]    
Receivables $ 831 $ 574