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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating Activities:    
Net income $ 40,136 $ 20,415
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization 3,519 3,204
Share-based compensation 2,352 3,418
Loss on sale of disposal of property, plant and equipment 50 93
Realized (gain) loss on investment securities, net 70 73
Amortization of premium on investment securities 434 547
Deferred income taxes (2,028) (991)
Changes in operating assets and liabilities:    
Accounts receivable 116 683
Inventory (23,615) 2,287
Income taxes, prepaid 2,272 807
Prepaid expenses and other current assets 453 1,098
Other assets 64 (137)
Accounts payable and accrued expenses 21,655 1,757
Net cash flow provided by operating activities 45,478 33,254
Investing Activities:    
Sale of investment securities 2,245 3,039
Purchase of investment securities   (4,093)
Sale of property and equipment 184 59
Purchase of property and equipment (3,246) (2,379)
Net cash flow used in investing activities (817) (3,374)
Financing Activities:    
Options exercised by executives and directors 220 568
Net shares repurchased for employee taxes (249) (833)
Cash dividends paid to stockholders (17,404) (11,511)
Stock repurchases (19,996)  
Net cash used in financing activities (37,429) (11,776)
Foreign currency impact (2) 13
Increase in cash and cash equivalents 7,230 18,117
Cash and cash equivalents - beginning of the period 75,077 52,436
Cash and cash equivalents - end of period 82,307 70,553
Supplemental disclosure of cash flow information:    
Income taxes paid 9,540 10,083
Dividends declared included in accounts payable $ 5,981 $ 4,114