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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating Activities    
Net income $ 41,956 $ 32,780
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 9,547 8,587
Amortization of bond premiums 216 168
Provision for losses on accounts receivable, net of adjustments 30 (48)
Provision for excess and obsolete inventories 420 (111)
Share-based compensation 3,172 2,076
Gain on disposal of assets (20) (59)
Foreign currency transaction (gain) loss (38) 114
Interest income on note receivable (21) (23)
Deferred (1,519) (1,000)
Changes in assets and liabilities:    
Accounts receivable (3,340) (1,685)
Income taxes 2,230 2,614
Inventories (5,322) (3,323)
Prepaid expenses and other (287) (154)
Accounts payable 949 (3,801)
Deferred revenue 334 138
Accrued liabilities and donations (1,300) 2,130
Net cash provided by operating activities 47,007 38,403
Investing Activities    
Capital expenditures (23,627) (12,775)
Proceeds from sale of property, plant and equipment 28 63
Payments to Acquire Other Investments 4,112 6,200
Maturities of certificates of deposits 9,840 4,658
Payments to Acquire Held-to-maturity Securities 10,384 14,183
Maturities of investments 5,622 9,907
Proceeds from called investments 1,511 757
Principal payments from note receivable 39 42
Net cash used in investing activities (21,083) (17,731)
Financing Activities    
Proceeds from Lines of Credit 761 0
Repayments of Lines of Credit 761 0
Stock options exercised 1,681 2,640
Repurchase of stock (14,572) (9,074)
Employee taxes paid by withholding shares (559) (362)
Cash dividends paid to stockholders (5,820) (5,965)
Net cash used in financing activities (19,270) (12,761)
Net increase in cash and cash equivalents 6,654 7,911
Cash and cash equivalents, beginning of period 7,908 21,952
Cash and cash equivalents, end of period $ 14,562 $ 29,863