Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 191,355	$ 173,553	$ 121,887
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	73,991	76,650	83,003
Non-cash lease expense	46,163	44,460	0
Stock-based compensation	24,060	9,909	26,609
Foreign currency (gains)/losses	(287)	3,829	16,381
Loss on disposal of assets	3,209	0	0
Impairment of fixed assets	0	0	48,551
Equity method earnings	0	0	(456)
Gain on step acquisition	0	0	(13,644)
Loss on extinguishment of debt	0	0	7,220
Deferred taxes	(11,914)	1,965	(14,929)
Changes in operating assets and liabilities:
Accounts receivable	(11,207)	2,746	(10,453)
Inventories, net	(31,137)	18,446	(33,371)
Prepaid expenses and other	(153)	(17,435)	(1,536)
Other assets	(31,616)	(67,109)	887
Accounts payable	24,836	(7,184)	(9,164)
Accrued expenses	87,452	(86,997)	(7,433)
Other liabilities	14,389	25,098	(10,814)
Net cash provided by operating activities	379,141	177,931	202,738
Cash flows from investing activities:
Purchases of property and equipment	(63,823)	(66,067)	(70,371)
Proceeds on investment sales	14,037	11,160	11,536
Purchases of investments	(14,693)	(8,432)	(11,420)
Acquisitions (net of cash acquired)	(14,949)	(8,073)	(38,506)
Net cash used in investing activities	(79,428)	(71,412)	(108,761)
Cash flows from financing activities:
Payment of cash dividends	(78,387)	(82,189)	(80,581)
Repurchase of shares of common stock	(144,334)	(825)	(69,565)
Exercise of employee stock options and taxes paid related to the net shares settlement of stock awards	5,764	(2,325)	10,777
Finance lease principal payments	(709)	0	0
Payment of debt issuance costs	0	0	(7,243)
Payments on long-term debt	(142,500)	(214,455)	(552,500)
Proceeds from long-term debt	115,000	145,000	582,398
Net cash used in financing activities	(245,166)	(154,794)	(116,714)
Effect of exchange rate changes on cash	12,506	(3,006)	(16,751)
Net increase (decrease) in cash and cash equivalents	67,053	(51,281)	(39,488)
Cash and cash equivalents, beginning of period	335,630	386,911	426,399
Cash and cash equivalents, end of period	$ 402,683	$ 335,630	$ 386,911