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Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2017
Receivables [Abstract]  
Schedule of accounts receivable
Accounts receivable consist of the following at March 31, 2017 and December 31, 2016:
(in thousands)
 
March 31, 
 2017
 
December 31, 
 2016
Trade receivables
 
$
354,940

 
$
323,725

Allowance for doubtful accounts
 
(4,006
)
 
(4,162
)
Other allowances
 
(7,688
)
 
(6,259
)
 
 
$
343,246

 
$
313,304