Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 111,202	$ 104,901
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	52,525	53,402
Equity method earnings	(655)	0
Japan customs expense	0	31,355
Foreign currency losses	(2,381)	14,749
Stock-based compensation	14,493	5,163
Deferred taxes	6,711	(5,718)
Changes in operating assets and liabilities:
Accounts receivable	(5,115)	671
Inventories, net	5,039	14,957
Prepaid expenses and other	(16,455)	(59,230)
Other assets	(3,960)	(3,842)
Accounts payable	(906)	10,927
Accrued expenses	(9,701)	19,635
Other liabilities	5,009	(1,540)
Net cash provided by operating activities	155,806	185,430
Cash flows from investing activities:
Purchases of property and equipment	(38,965)	(35,019)
Proceeds of investment sales	11,269	14,591
Purchases of investments	(8,244)	(17,024)
Acquisitions and investment in equity investee	(31,745)	(4,400)
Net cash used in investing activities	(67,685)	(41,852)
Cash flows from financing activities:
Exercises of employee stock options	16,377	6,295
Payment of cash dividends	(57,065)	(59,585)
Payments on long-term debt	(72,260)	(50,452)
Proceeds from long-term debt	67,000	233,721
Payment of debt issuance costs	0	(6,596)
Income tax benefit of options exercised	0	4,186
Repurchases of shares of common stock	(47,835)	(41,693)
Net cash provided by (used in) financing activities	(93,783)	85,876
Effect of exchange rate changes on cash	12,185	(1,814)
Net increase in cash and cash equivalents	6,523	227,640
Cash and cash equivalents, beginning of period	357,246	289,354
Cash and cash equivalents, end of period	$ 363,769	$ 516,994