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Consolidated Statements Of Cash Flows Unaudited - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash Flows from Operating Activities    
Net income $ 193,925 $ 205,714
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 44,701 42,237
Stock option expense 16,342 13,296
(Payments) Litigation settlements (9,440)  
Proceeds Litigation settlements   2,684
Noncash long-term incentive compensation 5,344 5,301
Noncash directors' compensation 1,173 1,171
(Benefit)/provision for deferred income taxes (561) 831
Amortization of debt issuance costs 229 229
Unutilized CARES Act grant   48,041
Deferred payroll taxes   22,941
Changes in operating assets and liabilities:    
Decrease in accounts receivable 9,247 27,993
Increase in inventories (1,299) (84)
Increase in prepaid expenses (6,117) (2,072)
Increase in accounts payable and other current liabilities 6,330 34,526
Change in current income taxes (15,749) (4,366)
Net change in lease assets and liabilities 15 1,583
Increase in other assets (13,561) (9,646)
Increase in other liabilities 13,474 10,735
Other sources 974 1,298
Net cash provided by operating activities 245,027 402,412
Cash Flows from Investing Activities    
Capital expenditures (44,472) (42,670)
Business combinations   (3,600)
Other sources 760 672
Net cash used by investing activities (43,712) (45,598)
Cash Flows from Financing Activities    
Purchases of treasury stock (330,380) (147,123)
Proceeds from exercise of stock options 17,918 31,498
Dividends paid (16,457) (15,639)
Capital stock surrendered to pay taxes on stock-based compensation (9,445) (18,707)
Change in cash overdrafts payable 3,054 (9,849)
Payments on revolving line of credit (1,500) (264,900)
Proceeds from revolving line of credit 1,500 174,900
Other sources/(uses) 63 (387)
Net cash used by financing activities (335,247) (250,207)
(Decrease)/Increase in Cash and Cash Equivalents (133,932) 106,607
Cash and cash equivalents at beginning of year 162,675 6,158
Cash and cash equivalents at end of period $ 28,743 $ 112,765