Operating Segments and Geographic Information - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income Before Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment and consolidated revenues	$ 2,460,979	$ 2,512,084	$ 2,606,485
Depreciation expense	(56,400)	(51,400)	(46,700)
Amortization of intangibles	(48,794)	(40,375)	(37,860)
Severance, restructuring, and acquisition integration costs	(16,820)	(18,654)	(16,470)
Gain on sale of assets	0	12,056	37,891
Consolidated operating income	266,460	317,518	363,334
Interest expense, net	(38,303)	(33,625)	(43,554)
Loss on debt extinguishment	0	0	(6,392)
Non-operating pension benefit (cost)	(215)	1,863	4,005
Consolidated income from continuing operations before taxes	227,942	285,756	317,393
Proceeds from sale of real estate			42,200
Gain on sale of real estate			37,900
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment and consolidated revenues	2,460,979	2,512,084	2,606,485
Total Segment EBITDA	409,858	436,435	438,596
Depreciation expense	(56,383)	(51,379)	(46,669)
Amortization of intangibles	(48,794)	(40,375)	(37,860)
Severance, restructuring, and acquisition integration costs	(22,814)	(25,152)	(16,685)
Amortization of software development intangible assets	(10,564)	(7,692)	(3,875)
Adjustments related to acquisitions and divestitures	(4,764)	(6,177)	(7,833)
Gain on sale of assets	0	12,056	37,891
Proceeds from sale of real estate		13,800	42,200
Gain on sale of real estate		12,100	37,900
Eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	$ (79)	$ (198)	$ (231)