v2.4.0.8
Accounts Receivable Securitization (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Accounts Receivable - Securitized $ 40,719   $ 40,719   $ 37,846
Increase (Decrease) in Accounts Receivable from Securitization 2,873        
AR securitization facility [Member]
          
Line of Credit Facility, Maximum Borrowing Capacity 200,000   200,000    
Current borrowing capacity of receivable facility 181,000   181,000   200,000
Letters of credit amount outstanding 159,281   159,281    
Costs associated with the receivables facility $ 440 $ 437 $ 913 $ 856  
Expiration date of receivables facility     Mar. 30, 2017