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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 106,768 $ 61,581
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 37,925 37,359
Non-cash lease expense 26,879 22,238
Stock-based compensation 13,383 8,324
Foreign currency losses 2,415 1,347
Loss on disposal of assets 2,189 2,580
Deferred taxes 3,007 506
Changes in operating assets and liabilities:    
Accounts receivable (2,789) (13,343)
Inventories, net (80,224) 9,951
Prepaid expenses and other (33,061) (5,025)
Other assets (19,897) (41,168)
Accounts payable (4,930) 13,063
Accrued expenses (55,429) 62,932
Other liabilities 5,623 5,736
Net cash provided by operating activities 1,859 166,081
Cash flows from investing activities:    
Purchases of property and equipment (36,849) (28,692)
Proceeds on investment sales 7,550 4,234
Purchases of investments (6,973) (4,031)
Acquisitions (net of cash acquired) (18,963) 0
Net cash used in investing activities (55,235) (28,489)
Cash flows from financing activities:    
Exercise of employee stock options and taxes paid related to the net shares settlement of stock awards 5,928 2,376
Payment of cash dividends (38,329) (40,042)
Repurchases of shares of common stock (60,410) (107,367)
Finance lease principal payments (956) 0
Payments of debt (25,000) (62,500)
Proceeds from debt 130,000 115,000
Net cash provided by /(used in) financing activities 11,233 (92,533)
Effect of exchange rate changes on cash (5,781) (5,177)
Net increase (decrease) in cash and cash equivalents (47,924) 39,882
Cash and cash equivalents, beginning of period 402,683 335,630
Cash and cash equivalents, end of period $ 354,759 $ 375,512