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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 | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) [Abstract] |  |  |  |
Sales | $ 381,603 | $ 307,942 | $ 730,107 | $ 598,039
Cost of sales | 270,557 | 216,427 | 517,354 | 417,417
Gross profit | 111,046 | 91,515 | 212,753 | 180,622
Selling, general and administrative expense | 82,647 | 68,250 | 162,193 | 134,653
Operating income | 28,399 | 23,265 | 50,560 | 45,969
Other expense (income), net | 141 | 21 | (9) | 22
Interest expense | 3,176 | 1,689 | 6,573 | 3,316
Income before income taxes | 25,082 | 21,555 | 43,996 | 42,631
Provision for income taxes | 9,543 | 7,806 | 16,839 | 15,650
Net income | 15,539 | 13,749 | 27,157 | 26,981
Preferred stock dividend | 22 | 22 | 45 | 45
Net income attributable to common shareholders | 15,517 | 13,727 | 27,112 | 26,936
Net income | 15,539 | 13,749 | 27,157 | 26,981
Loss on long-term investment, net of income taxes | 0 | (18) | (55) | (742)
Cumulative translation adjustment | 675 | (1,630) | (615) | (1,698)
Comprehensive income | $ 16,214 | $ 12,101 | $ 26,487 | $ 24,541
Basic earnings per share (in dollars per share) | $ 1.06 | $ 0.95 | $ 1.84 | $ 1.87
Weighted average common shares outstanding (in shares) | 14,708 | 14,451 | 14,716 | 14,424
Diluted earnings per share (in dollars per share) | $ 1.00 | $ 0.90 | $ 1.75 | $ 1.77
Weighted average common shares and common equivalent shares outstanding (in shares) | 15,548 | 15,291 | 15,556 | 15,264

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