CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income	$ 18,477	$ 20,750
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	1,659	1,604
Share-based compensation	981	990
Amortization of premium on investment securities	95	129
Deferred income taxes	37	(632)
Change in operating assets and liabilities:
Accounts receivable	1,047	380
Inventories	888	(4,369)
Income taxes, prepaid	4,976
Prepaid expenses and other current assets	(1,397)	(409)
Other assets	(1,764)	105
Accounts payable and accrued expenses	1,736	14,186
Net cash flow provided by operating activities	26,735	32,734
Investing Activities
Sale and maturities of investment securities	1,000	1,000
Purchase of property and equipment	(294)	(4,444)
Net cash flow provided by (used in) investing activities	706	(3,444)
Financing Activities
Options exercised by executives and directors		269
Net shares repurchased for employee taxes	(487)	(256)
Cash dividends paid to stockholders	(13,254)	(8,826)
Net cash flow used in financing activities	(13,741)	(8,813)
Foreign currency impact	(4)	1
Increase in cash and cash equivalents	13,696	20,478
Cash and cash equivalents - beginning of the period	76,974	81,364
Cash and cash equivalents - end of the period	90,670	101,842
Supplemental disclosure of cash flow information:
Income taxes paid (received)	80	(24)
Dividends declared included in accounts payable	$ 13,566	$ 9,229