Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows provided by (used in) operating activities:
Net income	$ 274,049	$ 248,623
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	185,968	163,454
Rationalization charges	13,026	7,247
Stock compensation expense	15,605	13,880
Loss on early extinguishment of debt	883	1,481
Other changes that provided (used) cash, net of effects from acquisitions:
Trade accounts receivable, net	(415,331)	(311,008)
Inventories	(78,738)	2,435
Trade accounts payable	62,303	(73,814)
Accrued liabilities	(33,488)	57,187
Other, net	(30,055)	8,981
Net cash (used in) provided by operating activities	(5,778)	118,466
Cash flows provided by (used in) investing activities:
Purchase of businesses, net of cash acquired	(718,430)	(940,875)
Capital expenditures	(172,994)	(165,163)
Other, net	2,234	999
Net cash used in investing activities	(889,190)	(1,105,039)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	1,155,199	993,406
Repayments under revolving loans	(248,310)	(748,539)
Proceeds from issuance of long-term debt	499,725	1,639,661
Repayments of long-term debt	(500,000)	(766,170)
Changes in outstanding checks - principally vendors	(84,216)	(79,006)
Dividends paid on common stock	(47,030)	(40,432)
Debt issuance costs	(4,909)	(10,265)
Repurchase of common stock	(8,573)	(13,155)
Net cash provided by financing activities	761,886	975,500
Effect of exchange rate changes on cash and cash equivalents	(5,832)	1,008
Cash and cash equivalents:
Net decrease	(138,914)	(10,065)
Balance at beginning of year	409,481	203,824
Balance at end of period	270,567	193,759
Interest paid, net	79,107	70,948
Income taxes paid, net	$ 79,812	$ 91,378