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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 20,415 $ 13,722
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and amortization 3,204 4,211
Share-based compensation 3,418 1,870
Gain on sale of disposal of property, plant and equipment 93 (13)
Realized loss on investment securities, net 73 (69)
Amortization of premium on investment securities 547 243
Deferred income taxes (991) (3,194)
Impairment of fixed assets   6,083
Changes in assets and liabilities:    
Accounts receivable 683 502
Inventory 2,287 (1,680)
Income taxes 807 2,793
Prepaid expenses and other current assets 1,098 (141)
Other assets (137) 43
Accounts payable and accrued expenses 1,757 1,766
Net cash flow provided by operating activities- continuing operations 33,254 26,136
Net cash flow used in operating activities- discontinued operations   (471)
Net cash dlow provided by operating activities 33,254 25,665
Cash Flow from Investing Activities:    
Sale of investment securities 3,039 26,741
Purchase of investment securities (4,093) (26,578)
Sale of property and equipment 59 676
Purchase of property and equipment (2,379) (2,039)
Net cash flow (used in) provided by investing activities (3,374) (1,200)
Cash Flow from Financing Activities:    
Repayment of capital leases   (163)
Options exercised by executives and directors 568 299
Excess tax benefits from share-based compensation   105
Net shares repurchased for employee taxes (833) (743)
Cash dividends paid to stockholders (11,511) (8,891)
Net cash used in financing activities (11,776) (9,393)
Foreign currency impact 13 11
Increase in cash and cash equivalents 18,117 15,083
Cash and cash equivalents - beginning of the period 52,436 42,037
Cash and cash equivalents - end of period 70,553 57,120
Supplemental disclosure of cash flow information:    
Income taxes paid 10,083 7,160
Dividends declared included in accounts payable $ 4,114 $ 3,162