CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities
Net income	$ 58,035	$ 40,136
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	3,363	3,519
Share-based compensation	3,415	2,352
Loss on sale of disposal of property, plant and equipment	17	50
Bad debt expense	3,209	642
Amortization of premium on investment securities	355	434
Deferred income taxes	1,093	(2,028)
Change in operating assets and liabilities:
Accounts receivable	(3,649)	(526)
Inventory	(13,037)	(23,615)
Income taxes, prepaid	(3,200)	2,272
Prepaid expenses and other current assets	(232)	453
Other assets	188	134
Accounts payable and accrued expenses	15,552	21,655
Net cash flow provided by operating activities	65,109	45,478
Investing Activities
Sale and maturities of investment securities	3,730	2,245
Sale of property and equipment		184
Purchase of property and equipment	(9,224)	(3,246)
Net cash flow used in investing activities	(5,494)	(817)
Financing Activities
Options exercised by executives and directors	279	220
Net shares repurchased for employee taxes	(289)	(249)
Cash dividends paid to stockholders	(26,658)	(17,404)
Stock repurchases	(33,114)	(19,996)
Net cash flow used in financing activities	(59,782)	(37,429)
Foreign currency impact	(1)	(2)
Increase in cash and cash equivalents	(168)	7,230
Cash and cash equivalents - beginning of the period	81,364	75,077
Cash and cash equivalents - end of period	81,196	82,307
Supplemental disclosure of cash flow information:
Income taxes paid	17,333	9,540
Dividends declared included in accounts payable	$ 8,955	$ 5,981