Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales:
Total net sales	$ 2,193,068	$ 2,144,051
Costs of goods sold:
Total costs of goods sold	1,861,594	1,818,715
Gross profit	331,474	325,336
Operating expenses:
Selling and administrative expenses	271,190	268,863
Severance and restructuring expenses, net	(6,740)	2,144
Acquisition and integration related expenses		1,466
Earnings from operations	67,024	52,863
Non-operating (income) expense:
Interest expense, net	9,969	11,826
Other expense (income), net	388	(1,563)
Earnings before income taxes	56,667	42,600
Income tax expense	13,499	8,639
Net earnings	$ 43,168	$ 33,961
Net earnings per share:
Basic	$ 1.23	$ 0.96
Diluted	$ 1.18	$ 0.95
Shares used in per share calculations:
Basic	35,199	35,233
Diluted	36,699	35,646
Products [Member]
Net sales:
Total net sales	$ 1,893,020	$ 1,848,316
Costs of goods sold:
Total costs of goods sold	1,721,258	1,670,238
Services [Member]
Net sales:
Total net sales	300,048	295,735
Costs of goods sold:
Total costs of goods sold	$ 140,336	$ 148,477