CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net earnings	$ 38,807	$ 15,424
Depreciation and amortization	23,861	24,225
Stock-based compensation	9,760	7,646
Gain (Loss) on Disposition of Assets	(30)	2,991
Deferred income taxes	23	(165)
Other, net	(6,987)	(3,152)
(Decrease) increase in cash, net of acquisitions, resulting from changes in:
Accounts receivable	(40,407)	12,118
Inventories	8,542	(14,453)
Prepaid expenses and other current assets	3,273	382
Other assets	3,443	(391)
Accounts payable	(5,783)	1,592
Deferred revenue	2,927	2,140
Accrued payroll and other liabilities	(16,777)	11,084
Accrued income taxes	5,410	(6,259)
Other long-term liabilities	(1,758)	(2,316)
Net cash provided by operating activities	24,304	50,866
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment, net	(14,183)	(12,717)
Net cash used in investing activities	(14,183)	(12,717)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from credit facility and long-term debt, including current portion	0	175,000
Repayments of credit facility	(3,285)	(3,021)
Repurchase of common stock	0	(150,000)
Dividends paid	(22,319)	(22,728)
Proceeds from shares issued pursuant to stock-based compensation plans	1,082	1,459
Payment, Tax Withholding, Share-based Payment Arrangement	(833)	(879)
Net cash used in financing activities	(25,355)	(169)
Effect of exchange rate changes on cash and cash equivalents	(5,258)	(13,957)
Net (decrease) increase in cash and cash equivalents	(20,492)	24,023
Cash, cash equivalents and restricted cash, beginning of year	297,795	284,592
Cash, cash equivalents and restricted cash, end of period	$ 277,303	$ 308,615