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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities      
Net income $ 45,728 $ 44,158 $ 37,547
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 11,741 11,553 12,312
Amortization of bond premiums 266 688 790
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) (48) (22) 141
Provision for excess and obsolete inventories 178 135 243
Share-based compensation 2,891 2,178 1,763
Excess tax benefits from stock options exercised and restricted stock awards vested (2,445) (1,239) (843)
Gain on disposition of assets (59) (305) (22)
Foreign currency transaction loss 139 74 67
Interest income on note receivable (30) (36) (40)
Deferred income taxes 1,172 (2,111) (1,594)
Write-off of note receivable 0 0 75
Changes in assets and liabilities:      
Accounts receivable (5,884) (5,007) 4,662
Income tax receivable 312 (257) 464
Inventories (1,059) (5,613) 231
Prepaid expenses and other 76 (305) 436
Accounts payable (5,109) 3,512 (5,197)
Deferred revenue 189 782 615
Accrued liabilities 4,852 4,094 1,942
Net cash provided by operating activities 52,910 52,279 53,592
Investing Activities      
Capital expenditures (20,967) (16,127) (9,041)
Proceeds from sale of property, plant and equipment 63 319 92
Investment in certificates of deposits (6,680) (9,940) (9,108)
Maturities of certificates of deposits 6,098 9,310 3,600
Purchase of investments held to maturity (14,183) (6,880) (22,275)
Maturities of investments 11,408 14,197 2,005
Proceeds from called investments 1,013 3,029 3,332
Principal payments from note receivable 54 63 69
Net cash used in investing activities (23,194) (6,029) (31,326)
Financing Activities      
Borrowings under revolving credit facility 0 0 8,325
Payments under revolving credit facility 0 0 (8,325)
Stock options exercised 2,795 1,318 1,467
Excess tax benefits from stock options exercised and restricted stock awards vested 2,445 1,239 843
Repurchase of stock (37,143) (29,284) (8,222)
Cash dividends paid to stockholders (11,857) (9,656) (7,428)
Net cash used in financing activities (43,760) (36,383) (13,340)
Net (decrease) increase in cash and cash equivalents (14,044) 9,867 8,926
Cash and cash equivalents, beginning of year 21,952 12,085 3,159
Cash and cash equivalents, end of year $ 7,908 $ 21,952 $ 12,085