CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net income	$ 42,133	$ 26,355
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	2,156	2,689
Share-based compensation	2,245	1,635
Loss on sale of disposal of property, plant and equipment	17	50
Realized (gain) loss on investment securities, net	8	(21)
Amortization of premium on investment securities	249	298
Deferred income taxes	375	(1,036)
Change in operating assets and liabilities:
Accounts receivable	33	199
Inventory	(9,585)	(6,670)
Income taxes, prepaid	(1,365)	2,673
Prepaid expenses and other current assets	(3,052)	368
Other assets	35	33
Accounts payable and accrued expenses	13,963	11,958
Net cash flow provided by operating activities	47,212	38,531
Investing Activities
Sale and maturities of investment securities	2,430	1,200
Sale of property and equipment		184
Purchase of property and equipment	(6,972)	(2,094)
Net cash flow used in investing activities	(4,542)	(710)
Financing Activities
Options exercised by executives and directors	279	62
Net shares repurchased for employee taxes	(256)	(215)
Cash dividends paid to stockholders	(17,749)	(11,673)
Stock repurchases	(9,998)	(19,996)
Net cash flow used in financing activities	(27,724)	(31,822)
Foreign currency impact	1
Increase in cash and cash equivalents	14,947	5,999
Cash and cash equivalents - beginning of the period	81,364	75,077
Cash and cash equivalents - end of period	96,311	81,076
Supplemental disclosure of cash flow information:
Income taxes paid	11,338	4,380
Dividends declared included in accounts payable	$ 9,102	$ 5,914