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	$ 156,497	$ 117,888
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,858	55,279
Non-cash lease expense	40,703	34,087
Stock-based compensation	16,476	15,439
Foreign currency losses	5,501	1,203
Loss on disposal of assets	13,210	2,516
Deferred taxes	3,846	(7,931)
Unrealized (gain)/losses on equity investments	(18,077)	0
Changes in operating assets and liabilities:
Accounts receivable, net	8,377	(9,273)
Inventories, net	(109,371)	4,882
Prepaid expenses and other	(29,311)	4,180
Other assets	(18,438)	(76,487)
Accounts payable	(11,182)	15,884
Accrued expenses	(89,993)	99,438
Other liabilities	5,977	27,343
Net cash provided by operating activities	32,073	284,448
Cash flows from investing activities:
Purchases of property and equipment	(50,384)	(48,810)
Proceeds on investment sales	11,171	7,630
Purchases of investments	(14,973)	(8,759)
Acquisitions (net of cash acquired)	(18,963)	0
Net cash used in investing activities	(73,149)	(49,939)
Cash flows from financing activities:
Exercise of employee stock options and taxes paid related to the net shares settlement of stock awards	7,874	3,321
Payment of cash dividends	(57,336)	(59,287)
Repurchases of shares of common stock	(70,415)	(127,361)
Finance lease principal payments	(1,409)	0
Payments of debt	(77,500)	(135,000)
Proceeds from debt	130,000	115,000
Net cash used in financing activities	(68,786)	(203,327)
Effect of exchange rate changes on cash	(10,409)	(102)
Net increase (decrease) in cash and cash equivalents	(120,271)	31,080
Cash and cash equivalents, beginning of period	402,683	335,630
Cash and cash equivalents, end of period	$ 282,412	$ 366,710