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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income / (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 1,872,700 | $ 41,684 | $ (3,349) | $ 689,657 | $ (3,683) | $ 1,148,391
Balance (in shares) at Dec. 31, 2010 |  | 416,840 | 808 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 122,408 |  |  |  |  | 122,408
Exercise of stock options and stock appreciation rights | (1,746) | 32 |  | (1,778) |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 319 |  |  |  |
Stock amortization and vesting | 13,950 | 88 |  | 13,862 |  |
Stock amortization and vesting (in shares) |  | 880 |  |  |  |
Sale of stock held in rabbi trust | 1,734 |  |  | 1,734 |  |
Cash dividends at $0.06, $0.04 and $0.03 per share for the year ended December 31, 2013, 2012 and 2011, respectively | (12,508) |  |  |  |  | (12,508)
Other comprehensive income / (loss) | 108,230 |  |  |  | 108,230 |
Balance at Dec. 31, 2011 | 2,104,768 | 41,804 | (3,349) | 703,475 | 104,547 | 1,258,291
Balance (in shares) at Dec. 31, 2011 |  | 418,039 | 808 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 131,730 |  |  |  |  | 131,730
Exercise of stock options and stock appreciation rights | (6,708) | 44 |  | (6,752) |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 438 |  |  |  |
Stock amortization and vesting | (919) | 238 |  | (1,157) |  |
Stock amortization and vesting (in shares) |  | 2,384 |  |  |  |
Cash dividends at $0.06, $0.04 and $0.03 per share for the year ended December 31, 2013, 2012 and 2011, respectively | (16,757) |  |  |  |  | (16,757)
Other comprehensive income / (loss) | (80,667) |  |  |  | (80,667) |
Balance at Dec. 31, 2012 | 2,131,447 | 42,086 | (3,349) | 695,566 | 23,880 | 1,373,264
Balance (in shares) at Dec. 31, 2012 |  | 420,861 | 808 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 279,773 |  |  |  |  | 279,773
Exercise of stock options and stock appreciation rights | (13,226) | 38 |  | (13,264) |  |
Exercise of stock options and stock appreciation rights (in shares) |  | 382 |  |  |  |
Stock amortization and vesting | 9,802 | 77 |  | 9,725 |  |
Stock amortization and vesting (in shares) |  | 772 |  |  |  |
Tax benefit of stock-based compensation | 18,913 |  |  | 18,913 |  |
Purchase of treasury stock | (164,634) |  | (164,634) |  |  |
Purchase of treasury stock (in shares) | 4,800 |  | 4,810 |  |  |
Cash dividends at $0.06, $0.04 and $0.03 per share for the year ended December 31, 2013, 2012 and 2011, respectively | (25,232) |  |  |  |  | (25,232)
Other comprehensive income / (loss) | (32,241) |  |  |  | (32,241) |
Balance at Dec. 31, 2013 | $ 2,204,602 | $ 42,201 | $ (167,983) | $ 710,940 | $ (8,361) | $ 1,627,805
Balance (in shares) at Dec. 31, 2013 |  | 422,015 | 5,618 |  |  |

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