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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities    
Net income $ 41,063 $ 18,477
Adjustments to reconcile net income to cash provided by operating activities    
Depreciation and amortization 2,013 1,659
Share-based compensation 2,198 981
Amortization of premium on investment securities 28 95
Deferred income taxes   37
Change in operating assets and liabilities:    
Accounts receivable 496 1,047
Inventories (8,842) 888
Income taxes, prepaid   4,976
Prepaid expenses and other current assets (762) (1,397)
Other assets (70) (1,764)
Accounts payable and accrued expenses 29,202 1,736
Net cash flow provided by operating activities 65,326 26,735
Investing Activities    
Sale and maturities of investment securities 3,720 1,000
Purchase of property and equipment (4,598) (294)
Net cash flow (used in) provided by investing activities (878) 706
Financing Activities    
Options exercised by executives and directors 481  
Net shares repurchased for employee taxes (1,807) (487)
Cash dividends paid to stockholders (13,392) (13,254)
Stock repurchases (7,500)  
Net cash flow used in financing activities (22,218) (13,741)
Foreign currency impact 78 (4)
Increase in cash and cash equivalents 42,308 13,696
Cash and cash equivalents - beginning of the period 163,723 76,974
Cash and cash equivalents - end of the period 206,031 90,670
Supplemental disclosure of cash flow information:    
Income taxes paid (received) 56 80
Dividends declared included in accounts payable $ 17,292 $ 13,566