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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME [Abstract] |  |
Sales | $ 348,504 | $ 290,097
Cost of sales | 246,797 | 200,990
Gross profit | 101,707 | 89,107
Selling, general and administrative expense | 79,546 | 66,403
Operating income | 22,161 | 22,704
Other expense (income), net | (150) | 1
Interest expense | 3,397 | 1,627
Income before income taxes | 18,914 | 21,076
Provision for income taxes | 7,296 | 7,844
Net income | 11,618 | 13,232
Preferred stock dividend | 23 | 23
Net income attributable to common shareholders | 11,595 | 13,209
Net income | 11,618 | 13,232
Loss on long-term investment, net of income taxes | (55) | (724)
Cumulative translation adjustment | (1,290) | (316)
Comprehensive income | $ 10,273 | $ 12,192
Basic earnings per share (in dollars per share) | $ 0.79 | $ 0.92
Weighted average common shares outstanding (in shares) | 14,724 | 14,395
Diluted earnings per share (in dollars per share) | $ 0.75 | $ 0.87
Weighted average common shares and common equivalent shares outstanding (in shares) | 15,564 | 15,235

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