Annual report pursuant to Section 13 and 15(d)

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

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Accounts Receivable, Net (Components Of Accounts Receivable, Net) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts Receivable, Net [Abstract]    
Trade accounts receivable $ 359,083 $ 307,279
Allowance for doubtful accounts (7,545) (7,098)
Accounts receivable, net $ 351,538 $ 300,181