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Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net sales | $ 1,485,765 | $ 1,176,306 | $ 791,976
Costs of goods sold | 916,205 | 735,906 | 497,322
Gross profit | 569,560 | 440,400 | 294,654
Operating expenses: |  |  |
Selling and service | 107,515 | 101,448 | 77,776
Research and development | 29,271 | 23,499 | 16,476
General and administrative | 55,490 | 46,031 | 30,012
Amortization of intangibles | 25,819 | 45,867 | 48,020
Trade name write-down | 0 | 0 | 9,389
Total operating expenses | 218,095 | 216,845 | 181,673
Income from operations | 351,465 | 223,555 | 112,981
Other (expense) income: |  |  |
Interest expense | (54,435) | (49,114) | (23,718)
Loss on extinguishment of debt | (15,336) | (14,308) | (377)
Investment income | 91 | 79 | 110
Costs related to acquisition | (1,086) | (1,062) | (875)
Other, net | (1,983) | (2,798) | (1,155)
Total other expense, net | (72,749) | (67,203) | (26,015)
Income before provision for income taxes | 278,716 | 156,352 | 86,966
Provision (benefit) for income taxes | 104,177 | 63,129 | (237,677)
Net income | 174,539 | 93,223 | 324,643
Net income per common share - basic: (in dollars per share) | $ 2.56 | $ 1.38 | $ 4.84
Weighted average common shares outstanding - basic: (in shares) | 68,081,632 | 67,360,632 | 67,130,356
Net income per common share - diluted: (in dollars per share) | $ 2.51 | $ 1.35 | $ 4.79
Weighted average common shares outstanding - diluted: (in shares) | 69,667,529 | 69,193,138 | 67,797,371
Dividends declared per share (in dollars per share) | $ 5.00 | $ 6.00 | $ 0
Other comprehensive income (loss): |  |  |
Amortization of unrealized loss on interest rate swaps | 2,381 | 2,082 | 0
Foreign currency translation adjustment | 1,238 | (34) | 0
Net unrealized gain (loss) on derivatives | 774 | 365 | (683)
Pension liability adjustment | 7,688 | (1,552) | (4,922)
Other comprehensive income (loss) | 12,081 | 861 | (5,605)
Comprehensive income | $ 186,620 | $ 94,084 | $ 319,038

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