CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 26,355	$ 13,729
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	2,689	2,116
Share-based compensation	1,635	2,215
Loss on sale of disposal of property, plant and equipment	50	93
Realized (gain) loss on investment securities, net	(21)	57
Amortization of premium on investment securities	298	374
Deferred income taxes	(1,036)	(700)
Changes in operating assets and liabilities:
Accounts receivable	199	477
Inventory	(6,670)	263
Income taxes, prepaid	2,673	1,979
Prepaid expenses and other current assets	368	292
Other assets	33	(124)
Accounts payable and accrued expenses	11,958	(22)
Net cash flow provided by operating activities	38,531	20,749
Investing Activities:
Sale of investment securities	1,200	2,039
Purchase of investment securities		(2,788)
Sale of property and equipment	184	59
Purchase of property and equipment	(2,094)	(1,020)
Net cash flow used in investing activities	(710)	(1,710)
Financing Activities:
Options exercised by executives and directors	62	568
Net shares repurchased for employee taxes	(215)	(825)
Cash dividends paid to stockholders	(11,673)	(7,692)
Stock repurchases	(19,996)
Net cash used in financing activities	(31,822)	(7,949)
Foreign currency impact		6
Increase in cash and cash equivalents	5,999	11,096
Cash and cash equivalents - beginning of the period	75,077	52,436
Cash and cash equivalents - end of period	81,076	63,532
Supplemental disclosure of cash flow information:
Income taxes paid	4,380	5,064
Dividends declared included in accounts payable	$ 5,914	$ 4,052