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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net sales | $ 3,665,308 |  | $ 2,843,877 |  | $ 2,620,111
Cost of sales | (2,806,121) |  | (2,203,286) |  | (2,078,088)
Gross profit | 859,187 |  | 640,591 |  | 542,023
Selling, general, and administrative expenses | (326,602) |  | (280,843) |  | (258,551)
Alternative energy tax credits | 0 |  | 95,500 |  | 0
Other expense, net | (58,978) |  | (11,789) |  | (10,723)
Income from operations | 473,607 | [1] | 443,459 |  | 272,749
Interest expense, net | (58,275) | [1],[2] | (62,900) | [3] | (29,245)
Income before taxes | 415,332 | [1] | 380,559 |  | 243,504
(Provision) benefit for income taxes | 20,951 |  | (216,739) |  | (85,477)
Net income | 436,283 |  | 163,820 |  | 158,027
Weighted average common shares outstanding |  |  |  |  |
Basic | 96,579 |  | 96,384 |  | 99,281
Diluted | 97,547 |  | 97,497 |  | 100,376
Net income per common share |  |  |  |  |
Basic | $ 4.52 |  | $ 1.70 |  | $ 1.59
Diluted | $ 4.47 |  | $ 1.68 |  | $ 1.57
Dividends declared per common share | $ 1.51 |  | $ 1.00 |  | $ 0.80
Other comprehensive income (loss), net of tax: |  |  |  |  |
Foreign currency translation adjustment | (136) |  | 0 |  | 0
Fair value adjustments to cash flow hedges, net of tax of $0.0 million, $6.5 million, and $15.3 million for 2013, 2012, and 2011, respectively | 0 |  | (10,183) |  | (24,134)
Reclassification adjustment to cash flow hedges included in net income, net of tax of $2.2 million, $1.2 million, and $0.7 million for 2013, 2012, and 2011, respectively | 3,481 |  | 1,842 |  | (1,125)
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $8.5 million, $4.3 million, and $2.4 million for 2013, 2012, and 2011, respectively | 13,409 |  | 6,689 |  | 3,806
Changes in unfunded employee benefit obligations, net of tax of $20.4 million, $9.3 million, and $20.3 million for 2013, 2012, and 2011, respectively | 32,264 |  | (14,612) |  | (31,944)
Other comprehensive income (loss) | 49,018 |  | (16,264) |  | (53,397)
Comprehensive income | $ 485,301 |  | $ 147,556 |  | $ 104,630
[1] | On October 25, 2013, we acquired Boise. The 2013 results include Boise for the period of October 25 through December 31, 2013.
[2] | Includes $10.5 million of expenses for financing the acquisition and $1.1 million of expense for the write-off of deferred financing costs.
[3] | Includes $24.8 million of debt refinancing charges, including the $21.3 million redemption premium, the $3.4 million charge to settle the treasury lock prior to its maturity, and $0.1 million of other items.

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