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SEGMENT INFORMATION
 3 Months Ended
Mar. 28, 2021
Segment Reporting [Abstract]  
SEGMENT INFORMATION
15. SEGMENT INFORMATION
The Company has two reportable segments, Manufacturing and Distribution, which are based on its method of internal reporting, which segregates its businesses based on the manner in which its chief operating decision maker allocates resources, evaluates financial results, and determines compensation.
The tables below present information about the sales and operating income of those segments. 
First Quarter Ended March 28, 2021      
(thousands) Manufacturing Distribution Total
Net outside sales $ 600,756  $ 249,727  $ 850,483 
Intersegment sales 13,808  1,403  15,211 
Total sales 614,564  251,130  865,694 
Operating income 78,429  21,175  99,604 
First Quarter Ended March 29, 2020      
(thousands) Manufacturing Distribution Total
Net outside sales $ 419,266  $ 169,966  $ 589,232 
Intersegment sales 7,573  1,300  8,873 
Total sales 426,839  171,266  598,105 
Operating income 45,704  9,968  55,672 
The following table presents a reconciliation of segment operating income to consolidated operating income:
  First Quarter Ended
(thousands) March 28, 2021 March 29, 2020
Operating income for reportable segments $ 99,604  $ 55,672 
Unallocated corporate expenses (19,217) (6,792)
Amortization (11,906) (9,601)
Consolidated operating income $ 68,481  $ 39,279 
Unallocated corporate expenses include corporate general and administrative expenses comprised of wages, insurance, taxes, supplies, travel and entertainment, professional fees and other.