Annual report pursuant to Section 13 and 15(d)

Accounts Receivable, Net Accounts Receivable, Net (Components of Accounts Receivable) (Details)

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Accounts Receivable, Net Accounts Receivable, Net (Components of Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Trade accounts receivable $ 315,160 $ 341,701
Allowance for doubtful accounts (8,282) (7,377)
Accounts receivable, net $ 306,878 $ 334,324