SEGMENT INFORMATION - Segment Information Applicable to Reportable Operating Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($) segment	Dec. 31, 2024 USD ($)
Segment Reporting Information
Number of reportable segments | segment	3	3
Number of operating segments | segment	3	3
Net sales	$ 701,046	$ 632,025
Cost of sales	573,735	513,953
Depreciation and amortization	3,099	3,266
Operating Income (Loss)	14,522	13,464
Interest income, net	3,900	4,567
Other income	76
Income before taxes	18,498	18,031
Total assets	1,247,503	1,161,065	$ 1,299,354
Enterprise Solutions
Segment Reporting Information
Net sales	298,003	282,659
Business Solutions
Segment Reporting Information
Net sales	258,385	255,869
Public Sector Solutions
Segment Reporting Information
Net sales	144,658	93,497
Operating Segments
Segment Reporting Information
Net sales	$ 701,046	$ 632,025
Other segment expenses, description	Other segment expenses for each of the reportable segments include service contracts/subscriptions, professional fees, facilities operations, credit card fees, and other miscellaneous expenses	Other segment expenses for each of the reportable segments include service contracts/subscriptions, professional fees, facilities operations, credit card fees, and other miscellaneous expenses
Operating Income (Loss)	$ 19,577	$ 16,286
Total assets	1,426,294	1,270,408
Operating Segments | Enterprise Solutions
Segment Reporting Information
Net sales	298,003	282,659
Cost of sales	255,705	239,925
Personnel costs	16,170	15,469
Marketing	2,097	1,887
Allocated corporate overhead	18,290	18,382
Depreciation and amortization	192	205
Other segment expenses	1,047	944
Operating Income (Loss)	4,502	5,847
Total assets	743,050	701,826
Operating Segments | Business Solutions
Segment Reporting Information
Net sales	258,385	255,869
Cost of sales	192,978	195,505
Personnel costs	17,775	17,963
Marketing	4,839	4,330
Allocated corporate overhead	21,476	20,508
Depreciation and amortization	155	163
Other segment expenses	2,745	1,611
Operating Income (Loss)	18,417	15,789
Total assets	578,687	514,019
Operating Segments | Public Sector Solutions
Segment Reporting Information
Net sales	144,658	93,497
Cost of sales	125,052	78,523
Personnel costs	9,586	8,291
Marketing	1,084	1,183
Allocated corporate overhead	10,738	10,254
Depreciation and amortization	23	23
Other segment expenses	1,517	573
Operating Income (Loss)	(3,342)	(5,350)
Total assets	104,557	54,563
Headquarters/Other
Segment Reporting Information
Unallocated Headquarters/Other expenses	(5,055)	(2,822)
Total assets	(178,791)	(109,343)
Intersegment Elimination
Segment Reporting Information
Total assets	$ (61,063)	$ (15,039)