Annual report pursuant to Section 13 and 15(d)

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

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Accounts Receivable, Net (Components of Accounts Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]    
Trade accounts receivable $ 342,234 $ 381,881
Allowance for doubtful accounts (8,556) (9,928)
Accounts receivable, net $ 333,678 $ 371,953