Segment Information - Segment Information Applicable to Reportable Operating Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($) segment	Dec. 31, 2024 USD ($)
Segment Reporting Information
Number of reportable segments | segment			3	3
Number of operating segments | segment			3	3
Net sales	$ 759,693	$ 736,479	$ 1,460,739	$ 1,368,504
Cost of sales	621,927	599,937	1,195,662	1,113,890
Depreciation and amortization			5,965	6,539
Operating income (loss)	30,897	30,919	45,419	44,383
Interest income, net	3,216	4,649	7,116	9,216
Other income			76
Income before taxes	34,113	35,568	52,611	53,599
Total assets	1,269,277	1,283,485	1,269,277	1,283,485	$ 1,299,354
Enterprise Solutions
Segment Reporting Information
Net sales	326,011	298,808	624,014	581,467
Business Solutions
Segment Reporting Information
Net sales	293,168	278,198	551,553	534,067
Public Sector Solutions
Segment Reporting Information
Net sales	140,514	159,473	285,172	252,970
Operating Segments
Segment Reporting Information
Net sales	759,693	736,479	$ 1,460,739	$ 1,368,504
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)	33,778	35,173	$ 53,355	$ 51,459
Total assets	1,434,475	1,374,487	1,434,475	1,374,487
Operating Segments | Enterprise Solutions
Segment Reporting Information
Net sales	326,011	298,808	624,014	581,467
Cost of sales	278,389	252,763	534,094	492,688
Personnel costs	16,995	15,346	33,165	30,815
Marketing	787	757	2,884	2,644
Allocated corporate overhead	18,069	18,433	36,359	36,815
Depreciation and amortization	195	221	387	426
Other segment expenses	1,230	1,058	2,277	2,002
Operating income (loss)	10,346	10,230	14,848	16,077
Total assets	753,931	729,450	753,931	729,450
Operating Segments | Business Solutions
Segment Reporting Information
Net sales	293,168	278,198	551,553	534,067
Cost of sales	224,319	211,872	417,297	407,377
Personnel costs	17,662	18,124	35,437	36,087
Marketing	2,564	3,672	7,403	8,002
Allocated corporate overhead	21,521	20,689	42,997	41,197
Depreciation and amortization	155	147	310	310
Other segment expenses	1,383	1,465	4,128	3,076
Operating income (loss)	25,564	22,229	43,981	38,018
Total assets	591,894	537,655	591,894	537,655
Operating Segments | Public Sector Solutions
Segment Reporting Information
Net sales	140,514	159,473	285,172	252,970
Cost of sales	119,219	135,302	244,271	213,825
Personnel costs	9,273	9,370	18,859	17,661
Marketing	575	812	1,659	1,995
Allocated corporate overhead	10,761	10,345	21,499	20,599
Depreciation and amortization	22	23	45	46
Other segment expenses	2,796	907	4,313	1,480
Operating income (loss)	(2,132)	2,714	(5,474)	(2,636)
Total assets	88,650	107,382	88,650	107,382
Headquarters/Other
Segment Reporting Information
Unallocated Headquarters/Other expenses	(2,881)	(4,254)	(7,936)	(7,076)
Total assets	(165,198)	(91,002)	(165,198)	(91,002)
Intersegment Elimination
Segment Reporting Information
Total assets	$ (46,339)	$ (59,751)	$ (46,339)	$ (59,751)