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Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net sales | $ 2,843,877 | $ 2,620,111 | $ 2,435,606
Cost of sales | (2,204,248) | (2,078,165) | (1,903,406)
Gross profit | 639,629 | 541,946 | 532,200
Selling and administrative expenses | (210,773) | (193,939) | (182,489)
Corporate overhead | (69,108) | (64,535) | (58,100)
Alternative fuel mixture credits | 95,500 |  | (86,265)
Other expense, net | (11,789) | (10,723) | (19,964)
Income from operations | 443,459 | 272,749 | 185,382
Interest expense, net | (62,900) | (29,245) | (32,278)
Income before taxes | 380,559 | 243,504 | 153,104
(Provision) benefit for income taxes | (216,739) | (85,477) | 52,331
Net income | 163,820 | 158,027 | 205,435
Weighted average common shares outstanding |  |  |
Basic | 96,384 | 99,281 | 101,678
Diluted | 97,497 | 100,376 | 102,608
Net income per common share |  |  |
Basic | $ 1.70 | $ 1.59 | $ 2.02
Diluted | $ 1.68 | $ 1.57 | $ 2.00
Dividends declared per common share | $ 1.00 | $ 0.80 | $ 0.60
Other comprehensive income (loss), net of tax: |  |  |
Fair value adjustments to cash flow hedges, net of tax of $6.5 million, $15.3 million and $2.3 million for 2012, 2011 and 2010, respectively | (10,183) | (24,134) | (1,646)
Reclassification adjustment for cash flow hedges included in net income, net of tax of $1.2 million, $0.7 million and $0.5 million for 2012, 2011 and 2010, respectively | 1,842 | (1,125) | (1,309)
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $4.3 million, $2.4 million and $2.3 million for 2012, 2011 and 2010, respectively | 6,689 | 3,806 | 3,583
Unfunded employee benefit obligations, net of tax of $9.3 million, $20.3 million and $5.7 million for 2012, 2011 and 2010, respectively | (14,612) | (31,944) | (8,973)
Other comprehensive income (loss) | (16,264) | (53,397) | (8,345)
Comprehensive income | $ 147,556 | $ 104,630 | $ 197,090

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