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Statements of Consolidated Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
OPERATING ACTIVITIES    
Net income $ 11,952 $ 10,154
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization 9,108 8,602
Provision for accounts receivable allowances 926 698
Provision for inventory reserves 1,246 1,306
Deferred income taxes (143) (1,144)
Share-based compensation expense 2,187 927
Loss on sale of property and equipment 22 2
Other - net 344 411
Changes in operating assets and liabilities    
Accounts receivable (15,244) (4,743)
Inventories 589 (2,851)
Trade accounts payable and accrued liabilities 8,847 9,561
Income taxes - net 3,324 (335)
Other - net (1,445) (1,552)
NET CASH PROVIDED BY OPERATING ACTIVITIES 21,713 21,036
INVESTING ACTIVITIES    
Capital expenditures (7,832) (21,697)
Proceeds from the sale of property and equipment 52 61
Restricted cash and maturity (purchase) of fixed-term deposits - net 7,812 (1,314)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES 32 (22,950)
FINANCING ACTIVITIES    
Decrease in notes payable to banks (826) (172)
Proceeds from the issuance of long-term debt 38,557 56,513
Payments of long-term debt (48,752) (42,650)
Dividends paid (3,149) (3,131)
Excess tax expenses from share-based awards 0 (2)
Proceeds from issuance of common shares 0 378
Purchase of common shares for treasury (2) (2,915)
Purchase of common shares for treasury from related parties (1,488) (1,488)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (15,660) 6,533
Effects of exchange rate changes on cash and cash equivalents 2,341 (2,072)
Net increase in cash and cash equivalents 8,426 2,547
Cash and cash equivalents at beginning of year 30,737 30,393
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 39,163 $ 32,940