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Accounts Receivable Accounts Receivable - Balance and Activity in Allowance for Doubtful Accounts (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additions charged to costs and expenses(1) $ 5,497 [1] $ 1,735 [1] $ 2,511 [1]
Customer in Bankruptcy
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additions charged to costs and expenses(1) $ 2,700    
[1] Includes $2.7 million of allowance for receivables deemed uncollectible at December 31, 2013 primarily due to bankruptcy status of customers.