SEGMENT INFORMATION - Segment Information Applicable to Reportable Operating Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($) segment	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($) segment	Dec. 31, 2022 USD ($)
Segment Reporting Information
Number of reportable segments | segment	3	3	3	3
Number of operating segments | segment	3	3	3	3
Net sales:
Net sales	$ 733,547	$ 828,509	$ 1,461,092	$ 1,616,853
Operating income (loss):
Operating income (loss)	25,071	34,770	43,188	64,905
Other expenses, net	1,874	15	3,160	11
Income before taxes	26,945	34,785	46,348	64,916
Depreciation and amortization:
Depreciation and amortization	3,094	2,989	6,167	5,980
Total assets:
Total assets	1,164,275	1,123,633	1,164,275	1,123,633	$ 1,099,826
Business Solutions
Net sales:
Net sales	261,027	328,351	534,141	648,794
Enterprise Solutions
Net sales:
Net sales	287,153	348,954	601,096	684,351
Public Sector Solutions
Net sales:
Net sales	185,367	151,204	325,855	283,708
Operating Segments | Business Solutions
Net sales:
Net sales	261,027	328,351	534,141	648,794
Operating income (loss):
Operating income (loss)	18,831	22,279	35,384	42,952
Depreciation and amortization:
Depreciation and amortization	158	168	317	335
Total assets:
Total assets	472,566	430,763	472,566	430,763
Operating Segments | Enterprise Solutions
Net sales:
Net sales	287,153	348,954	601,096	684,351
Operating income (loss):
Operating income (loss)	7,511	15,389	14,033	29,703
Depreciation and amortization:
Depreciation and amortization	423	501	847	1,035
Total assets:
Total assets	678,104	663,837	678,104	663,837
Operating Segments | Public Sector Solutions
Net sales:
Net sales	185,367	151,204	325,855	283,708
Operating income (loss):
Operating income (loss)	1,650	1,071	1,679	(55)
Depreciation and amortization:
Depreciation and amortization	20	20	39	39
Total assets:
Total assets	102,652	86,743	102,652	86,743
Headquarters/Other
Operating income (loss):
Operating income (loss)	(2,921)	(3,969)	(7,908)	(7,695)
Depreciation and amortization:
Depreciation and amortization	2,493	2,300	4,964	4,571
Total assets:
Assets net of intercompany balance eliminations	(89,047)	(57,710)	(89,047)	(57,710)
Intersegment Elimination
Total assets:
Total assets	$ (55,432)	$ (41,439)	$ (55,432)	$ (41,439)