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Statements of Consolidated Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
OPERATING ACTIVITIES      
Net income $ 20,587 $ 29,286 $ 30,984
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 12,088 11,564 10,525
Provision for accounts receivable allowances 837 1,416 1,292
Provision for inventory reserves 2,672 1,981 1,480
Deferred income taxes (1,105) (2,927) (688)
Share-based compensation expense 3,057 3,080 2,933
Excess tax benefits from share-based awards (357) (197) (203)
Goodwill impairment 862 0 0
Net investment in life insurance 10 (3) (28)
Other - net (56) (137) 73
Changes in operating assets and liabilities:      
Accounts receivable (10,273) 5,047 (16,061)
Inventories 3,040 1,290 (21,197)
Trade accounts payables and accrued liabilities (3,906) (3,196) 8,574
Income taxes payable (4,670) 3,381 (815)
Other - net (1,247) (200) 180
NET CASH PROVIDED BY OPERATING ACTIVITIES 18,223 50,385 17,049
INVESTING ACTIVITIES      
Capital expenditures (21,034) (21,043) (18,912)
Business acquisitions, net of cash acquired 0 (5,173) 0
Proceeds from the sale of property and equipment 532 1,965 464
Restricted cash and long-term term deposits (3,642) 0 (328)
NET CASH USED IN INVESTING ACTIVITIES (24,144) (24,251) (18,776)
FINANCING ACTIVITIES      
Increase (decrease) in notes payable to banks 922 (1,734) 1,015
Proceeds from the issuance of long-term debt 73,638 70,058 79,110
Payments of long-term debt (69,884) (89,060) (61,065)
Dividends paid (2,305) (6,492) (4,381)
Excess tax benefits from share-based awards 357 197 203
Earn-out consideration payment (513) (1,148) 0
Proceeds from issuance of common shares 1,519 549 1,064
Purchase of common shares for treasury (2,881) (333) (623)
Purchase of common shares for treasury from related parties (4,030) (2,457) (2,899)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES (3,177) (30,420) 12,424
Effects of exchange rate changes on cash and cash equivalents 1,953 280 (1,226)
Net increase (decrease) in cash and cash equivalents (3,829) (4,006) 9,471
Cash and cash equivalents at beginning of year 28,120 32,126 22,655
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 24,291 $ 28,120 $ 32,126