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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of carrying values of inventories Inventories at the dates indicated consisted of the following: 
 
At March 31,
 
At December 31,
(in thousands)
2019
 
2018
 
2018
Raw materials
$
91,850

 
$
87,363

 
$
98,058

In-process products
24,690

 
28,406

 
24,645

Finished products
155,919

 
140,783

 
153,385

 
$
272,459

 
$
256,552

 
$
276,088