Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 69,530	$ 48,029
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,080	34,684
Equity method earnings	(358)	0
Japan customs expense	0	31,355
Foreign currency losses	(256)	13,519
Stock-based compensation	7,581	7,586
Deferred taxes	5,390	2,463
Changes in operating assets and liabilities:
Accounts receivable	(2,812)	4,595
Inventories, net	8,706	6,871
Prepaid expenses and other	(15,140)	(62,091)
Other assets	(2,567)	12
Accounts payable	(4,357)	14,353
Accrued expenses	(21,607)	36,486
Other liabilities	4,839	(2,037)
Net cash provided by operating activities	84,029	135,825
Cash flows from investing activities:
Purchases of property and equipment	(27,751)	(24,714)
Proceeds of investment sales	7,741	10,881
Purchases of investments	(4,716)	(9,869)
Acquisition and investment in equity investee	(25,095)	(4,400)
Net cash used in investing activities	(49,821)	(28,102)
Cash flows from financing activities:
Exercise of employee stock options and taxes paid related to the net shares settlement of stock awards	7,795	2,777
Payments on long-term debt	(64,495)	(18,978)
Payment of cash dividends	(38,042)	(39,698)
Income tax benefit of equity awards	0	3,520
Proceeds from long-term debt	67,000	233,721
Payment of debt issuance costs	0	(6,596)
Repurchases of shares of common stock	(22,135)	(24,296)
Net cash provided by (used in) financing activities	(49,877)	150,450
Effect of exchange rate changes on cash	3,525	(2,679)
Net increase (decrease) in cash and cash equivalents	(12,144)	255,494
Cash and cash equivalents, beginning of period	357,246	289,354
Cash and cash equivalents, end of period	$ 345,102	$ 544,848