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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty, Accrued Liabilities, and Basic and Diluted Income per Share (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Changes in the reserve for product warranty claims |  |  |  |  |
Warranty reserve at beginning of the year | $ 922 | $ 830 | $ 780 |  |
Warranty reserves acquired | 117 |  | 297 |  |
Provision | (13) | 234 | (138) |  |
Warranty expenditures | (34) | (200) | (96) |  |
Effect of foreign currency translation | (21) | 58 | (13) |  |
Warranty reserve at end of year | 971 | 922 | 830 |  |
Accrued Liabilities |  |  |  |  |
Compensation and fringe benefits |  |  |  | $ 11,642 | $ 7,459
Warranty reserve | $ 922 | $ 830 | $ 780 | 971 | 922
Income taxes payable |  |  |  | 1,182 | 2,397
Other accrued expenses |  |  |  | 4,927 | 3,492
Accrued liabilities |  |  |  | $ 18,722 | $ 14,270
Basic and Diluted Income per Share |  |  |  |  |
Dilutive effect of outstanding stock option awards (in shares) | 106,000 | 105,000 | 94,000 |  |
Stock awards excluded from the calculation of diluted income per share (in shares) | 1,400 | 600 | 30,700 |  |
Minimum |  |  |  |  |
Warranty |  |  |  |  |
Warranty period | 3 months |  |  |  |
Maximum |  |  |  |  |
Warranty |  |  |  |  |
Warranty period | 2 years |  |  |  |

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