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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Treaury Stock | Paid-In Capital | Accumulated Other Comprehensive Income / (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 1,812,514 | $ 20,772 | $ (3,349) | $ 695,183 | $ 42,436 | $ 1,057,472
Balance (in shares) at Dec. 31, 2009 |  | 207,712 | 404 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 103,386 |  |  |  |  | 103,386
Exercise of stock options and stock appreciation rights | 770 | 8 |  | 762 |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 78 |  |  |  |
Tax benefit of stock-based compensation | 108 |  |  | 108 |  |
Stock amortization and vesting | 12,930 | 62 |  | 12,868 |  |
Stock amortization and vesting (in shares) |  | 630 |  |  |  |
Sale of stock held in rabbi trust | 1,578 |  |  | 1,578 |  |
Cash dividends at $0.08, $0.06 and $0.06 per share for the year ended December 31, 2012, 2011 and 2010, respectively | (12,467) |  |  |  |  | (12,467)
Other comprehensive income / (loss) | (46,119) |  |  |  | (46,119) |
Balance at Dec. 31, 2010 | 1,872,700 | 20,842 | (3,349) | 710,499 | (3,683) | 1,148,391
Balance (in shares) at Dec. 31, 2010 |  | 208,420 | 404 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 122,408 |  |  |  |  | 122,408
Exercise of stock options and stock appreciation rights | (1,746) | 16 |  | (1,762) |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 159 |  |  |  |
Stock amortization and vesting | 13,950 | 44 |  | 13,906 |  |
Stock amortization and vesting (in shares) |  | 440 |  |  |  |
Sale of stock held in rabbi trust | 1,734 |  |  | 1,734 |  |
Cash dividends at $0.08, $0.06 and $0.06 per share for the year ended December 31, 2012, 2011 and 2010, respectively | (12,508) |  |  |  |  | (12,508)
Other comprehensive income / (loss) | 108,230 |  |  |  | 108,230 |
Balance at Dec. 31, 2011 | 2,104,768 | 20,902 | (3,349) | 724,377 | 104,547 | 1,258,291
Balance (in shares) at Dec. 31, 2011 |  | 209,019 | 404 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 131,730 |  |  |  |  | 131,730
Exercise of stock options and stock appreciation rights | (6,708) | 22 |  | (6,730) |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 219 |  |  |  |
Stock amortization and vesting | (919) | 119 |  | (1,038) |  |
Stock amortization and vesting (in shares) |  | 1,192 |  |  |  |
Cash dividends at $0.08, $0.06 and $0.06 per share for the year ended December 31, 2012, 2011 and 2010, respectively | (16,757) |  |  |  |  | (16,757)
Other comprehensive income / (loss) | (80,667) |  |  |  | (80,667) |
Balance at Dec. 31, 2012 | $ 2,131,447 | $ 21,043 | $ (3,349) | $ 716,609 | $ 23,880 | $ 1,373,264
Balance (in shares) at Dec. 31, 2012 |  | 210,430 | 404 |  |  |

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