Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Accounts Receivable, Net (Components of Accounts Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Receivables [Abstract]      
Trade accounts receivable $ 460,433   $ 373,905
Allowance for doubtful accounts (11,051)   (9,043)
Accounts receivable, net $ 449,382 $ 429,381 $ 364,862