CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net income	$ 74,865	$ 58,035
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	5,259	5,097
Share-based compensation	4,243	3,415
Loss on sale of disposal of property, plant and equipment	28	17
Bad debt expense	508	3,209
Amortization of premium on investment securities	263	355
Deferred income taxes	(735)	1,093
Change in operating assets and liabilities:
Accounts receivable	282	(3,649)
Inventories	7,035	(13,037)
Income taxes, prepaid	5,169	(3,200)
Prepaid expenses and other current assets	938	(232)
Other assets	(2,566)	188
Accounts payable and accrued expenses	30,078	13,818
Net cash flow provided by operating activities	125,367	65,109
Investing Activities
Sale and maturities of investment securities	2,000	3,730
Purchase of property and equipment	(3,852)	(9,224)
Net cash flow provided by (used in) investing activities	(1,852)	(5,494)
Financing Activities
Options exercised by executives and directors	1,424	279
Net shares repurchased for employee taxes	(532)	(289)
Cash dividends paid to stockholders	(39,892)	(26,658)
Stock repurchases	(5,000)	(33,114)
Net cash flow used in financing activities	(44,000)	(59,782)
Foreign currency impact	(3)	(1)
Increase in cash and cash equivalents	79,512	(168)
Cash and cash equivalents - beginning of the period	76,974	81,364
Cash and cash equivalents - end of the period	156,486	81,196
Supplemental disclosure of cash flow information:
Income taxes paid (received)	14,135	17,333
Dividends declared included in accounts payable	$ 13,715	$ 8,955