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Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 634,238 | $ 921 | $ (602) | $ 647,374 | $ (13,455)
Balance, shares at Dec. 31, 2011 |  | 92,461 | 22 |  |
Stock-based compensation, shares |  | 952 |  |  |
Stock-based compensation | 6,627 |  |  | 6,627 |
Vesting of restricted shares |  | 2 |  | (2) |
Treasury stock - tax withholdings, shares |  | (44) | 44 |  |
Treasury stock - tax withholdings | (1,299) |  | (1,299) |  |
Net income | 110,798 |  |  |  | 110,798
Balance at Sep. 30, 2012 | $ 750,364 | $ 923 | $ (1,901) | $ 653,999 | $ 97,343
Balance, shares at Sep. 30, 2012 |  | 93,369 | 66 |  |

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