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Statements of Consolidated Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net income $ 12,654 $ 15,255 $ 6,675
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 12,790 11,996 11,532
Provision for accounts receivable allowances 1,165 2,184 961
Provision for inventory reserves 1,205 2,736 2,477
Deferred income taxes 2,436 2,249 (944)
Share-based compensation expense 3,055 1,366 248
Loss (gain) on sale of property and equipment 160 (20) 363
Other - net 213 539 87
Changes in operating assets and liabilities (excluding impact of acquired assets):      
Accounts receivable (9,205) (2,292) (2,965)
Inventories (2,208) (6,354) (2,297)
Trade accounts payables and accrued liabilities 4,732 3,279 5,652
Income taxes, net 7,134 (4,999) (4,038)
Other - net (301) 35 2,478
NET CASH PROVIDED BY OPERATING ACTIVITIES 33,830 25,974 20,229
INVESTING ACTIVITIES      
Capital expenditures (11,233) (24,725) (10,754)
Business acquisitions, net of cash acquired 0 0 0
Proceeds from the sale of property and equipment 142 70 929
Restricted cash and purchase of fixed-term deposits 9,191 (3,814) (1,037)
NET CASH USED IN INVESTING ACTIVITIES (1,900) (28,469) (10,862)
FINANCING ACTIVITIES      
(Decrease) Increase in notes payable to banks (537) 851 (775)
Proceeds from the issuance of long-term debt 55,581 70,274 51,942
Payments of long-term debt (63,981) (57,742) (51,940)
Dividends paid (4,099) (4,170) (4,391)
Excess tax benefits from share-based awards 0 (2) (20)
Proceeds from issuance of common shares 1,962 248 80
Purchase of common shares for treasury (2) (3,108) (6,003)
Purchase of common shares for treasury from related parties (8,475) (1,962) (1,550)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (19,551) 4,389 (12,657)
Effects of exchange rate changes on cash and cash equivalents 1,242 (1,550) 4,040
Net increase in cash and cash equivalents 13,621 344 750
Cash and cash equivalents at beginning of year 30,737 30,393 29,643
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 44,358 $ 30,737 $ 30,393