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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities      
Net income $ 54,498 $ 53,376 $ 45,728
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 15,007 13,035 11,741
Amortization of bond premiums 47 249 266
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) 179 (25) (48)
Provision for excess and obsolete inventories 264 625 178
Share-based compensation 6,458 4,357 2,891
Loss (gain) on disposition of assets 45 (20) (59)
Foreign currency transaction (gain) loss (59) (22) 139
Interest income on note receivable (25) (28) (30)
Deferred income taxes (1,554) 825 1,172
Changes in assets and liabilities:      
Accounts receivable (7,516) 7,048 (5,884)
Income tax receivable 4,596 (1,537) 312
Inventories (23,698) (9,478) (1,059)
Prepaid expenses and other 98 (83) 76
Accounts payable 3,043 654 (5,109)
Deferred revenue 258 417 189
Accrued liabilities and donations 6,353 (5,470) 4,852
Net cash provided by operating activities 57,994 63,923 55,355
Investing Activities      
Capital expenditures (41,713) (26,604) (20,967)
Proceeds from sale of property, plant and equipment 10 28 63
Investment in certificates of deposits (5,280) (4,112) (6,680)
Maturities of certificates of deposits 7,912 10,560 6,098
Purchase of investments held to maturity (13,241) (10,384) (14,183)
Maturities of investments 19,700 10,021 11,408
Proceeds from called investments 1,500 3,514 1,013
Principal payments from note receivable 60 52 54
Net cash used in investing activities (31,052) (16,925) (23,194)
Financing Activities      
Borrowings under revolving credit facility 0 761 0
Payments under revolving credit facility 0 (761) 0
Stock options exercised 2,259 2,063 2,795
Repurchase of stock (16,620) (19,317) (36,558)
Employee taxes paid by withholding shares (1,614) (823) (585)
Cash dividends paid to stockholders (13,663) (12,676) (11,857)
Net cash used in financing activities (29,638) (30,753) (46,205)
Net increase (decrease) in cash and cash equivalents (2,696) 16,245 (14,044)
Cash and cash equivalents, beginning of year 24,153 7,908 21,952
Cash and cash equivalents, end of year $ 21,457 $ 24,153 $ 7,908