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Consolidated Statement Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 2,516,631 | $ 1,833 | $ 840,731 | $ 2,279,367 | $ 19,459 | $ (624,759)
Balance (in shares) at Dec. 31, 2011 | 183,295,350 | 183,295,000 |  |  |  |
Net income | 189,812 |  |  | 189,812 |  |
Foreign currency translation adjustment | (612) |  |  |  | (612) |
Issuance of restricted stock (in shares) |  | 788,000 |  |  |  |
Issuance of restricted stock |  | 8 | (8) |  |  |
Vesting of stock unit awards |  | 8,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (51,000) |  |  |  |
Forfeitures of restricted stock |  | (1) | 1 |  |  |
Exercise of stock options (in shares) | 13,300 | 13,000 |  |  |  |
Exercise of stock options | 195 |  | 195 |  |  |
Stock-based compensation | 11,240 |  | 11,240 |  |  |
Tax expense related to stock-based compensation | (1,208) |  | (1,208) |  |  |
Payment of cash dividends | (15,438) |  |  | (15,438) |  |
Purchase of treasury stock | (71,337) |  |  |  |  | (71,337)
Balance at Jun. 30, 2012 | $ 2,629,283 | $ 1,840 | $ 850,951 | $ 2,453,741 | $ 18,847 | $ (696,096)
Balance (in shares) at Jun. 30, 2012 | 184,053,434 | 184,053,000 |  |  |  |

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