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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 42,949 $ 35,675 $ 30,158
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 13,073 9,188 10,963
Impairment of goodwill and trademark 837   2,213
Provision for doubtful accounts 2,838 3,127 1,394
Noncash stock compensation 1,060 895 947
Excess tax benefits from stock-based compensation arrangements (110)    
Deferred tax (benefit) (1,009) (4,558) (3,079)
Change in fair value of derivatives (272) (362) (861)
Changes in:      
Accounts receivable (88,915) (5,915) 20,912
Inventories (60,494) (29,110) 40,628
Other assets 993 2,127 (4,841)
Accounts payable and accrued expenses 72,664 20,804 (18,900)
Income taxes, net (7,335) 5,974 5,106
Net cash provided by (used in) operating activities (23,721) 37,845 84,640
Cash flows from investing activities:      
Purchases of short-term investments (10,823) (112,495)  
Proceeds from sale of short-term investments 62,111 63,510  
Purchase of equipment and leasehold improvements (9,946) (6,085) (5,526)
Payment for intangible assets acquired (4,605) (22,209) (775)
Net cash provided by (used in) investing activities 36,737 (77,279) (6,301)
Cash flows from financing activities:      
Proceeds from (repayment of) loans payable - banks 7,230 254 (9,005)
Repayment of long-term debt (11,673) (10,865) (12,408)
Purchase of treasury stock   (106) (660)
Proceeds from exercise of options and warrants including tax benefits 983 3,009 1,648
Excess tax benefits from stock-based compensation arrangements 110    
Proceeds from sale of stock of subsidiary 2,756 5,326 2,658
Payment for acquisition of noncontrolling interests (750) (4,595)  
Dividends paid (9,304) (6,918) (3,974)
Dividends paid to noncontrolling interests (3,149) (2,048) (1,716)
Net cash used in financing activities (13,797) (15,943) (23,457)
Effect of exchange rate changes on cash (911) (7,542) 3,181
Net increase (decrease) in cash and cash equivalents (1,692) (62,919) 58,063
Cash and cash equivalents - beginning of year 37,548 100,467 42,404
Cash and cash equivalents - end of year 35,856 37,548 100,467
Cash paid for:      
Interest 1,972 2,297 2,633
Income taxes $ 32,716 $ 14,944 $ 13,085