Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income	$ 94,576	$ 50,387
Adjustments to reconcile net income to net cash provided by operating activities:
Loss/(gain) on sale of assets and other	(1,267)	333
Depreciation and amortization	10,795	11,225
Noncash lease expense	2,477	2,393
Deferred income taxes	(1,810)	314
Noncash compensation related to stock plans	4,872	6,542
Provision of doubtful accounts	(211)	(215)
Changes in operating assets and liabilities:
Trade accounts receivable	(89,799)	(62,660)
Inventories	(381)	(14,750)
Trade accounts payable	17,929	17,301
Other current assets	(16,479)	(14,109)
Accrued liabilities and other current liabilities	21,707	22,126
Other noncurrent assets and liabilities	2,270	(1,054)
Net cash provided by operating activities	44,679	17,833
Cash flows from investing activities
Capital expenditures	(17,823)	(10,505)
Asset acquisitions	(488)	0
Equity method investments	(600)	(5,329)
Proceeds from sale of property and equipment	1,830	105
Net cash used in investing activities	(17,081)	(15,729)
Cash flows from financing activities
Repurchase of common stock	(21,281)	0
Proceeds from lines of credit and term loan borrowing	700,038	0
Repayments of lines of credit and capital leases	(1,024)	(192)
Debt issuance costs	(6,804)	0
Dividends paid	(10,806)	(9,967)
Cash paid on behalf of employees for shares withheld	(9,523)	(5,263)
Net cash provided by (used in) financing activities	650,600	(15,422)
Effect of exchange rate changes on cash and cash equivalents	5,019	(3,893)
Net increase (decrease) in cash and cash equivalents	683,217	(17,211)
Cash and cash equivalents at beginning of period	301,155	274,639
Cash and cash equivalents at end of period	984,372	257,428
Noncash activity during the period
Noncash capital expenditures	761	1,526
Dividends declared but not paid	10,847	9,967
Issuance of Company’s common stock for compensation	$ 960	$ 692