CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net income	$ 20,750	$ 12,222
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	1,067	1,544
Share-based compensation	990	805
Loss on sale of disposal of property, plant and equipment		214
Realized loss on investment securities, net	82	57
Amortization of premium on investment securities	129	153
Deferred income taxes	(632)	(105)
Change in operating assets and liabilities:
Accounts receivable	380	108
Inventory	(4,369)	2,942
Income taxes, prepaid		2,738
Prepaid expenses and other current assets	(409)	727
Other assets	23	(1)
Accounts payable and accrued expenses	14,723	(3,396)
Net cash flow provided by operating activities	32,734	18,008
Investing Activities
Sale and maturities of investment securities	1,000	1,200
Purchase of property and equipment	(4,444)	(1,286)
Net cash flow used in investing activities	(3,444)	(86)
Financing Activities
Options exercised by executives and directors	269	62
Net shares repurchased for employee taxes	(256)	(215)
Cash dividends paid to stockholders	(8,826)	(5,883)
Net cash flow used in financing activities	(8,813)	(6,036)
Foreign currency impact	1
Increase in cash and cash equivalents	20,478	11,886
Cash and cash equivalents - beginning of the period	81,364	75,077
Cash and cash equivalents - end of period	101,842	86,963
Supplemental disclosure of cash flow information:
Income taxes received	24
Dividends declared included in accounts payable	$ 9,229	$ 5,943