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Consolidated Statement of Stockholders' Equity (USD $) In Thousands | Total | Special Dividend | Regular Dividend | Common Stock | Common Stock Special Dividend | Additional Paid-in Capital | Additional Paid-in Capital Special Dividend | Retained Earnings | Retained Earnings Special Dividend | Retained Earnings Regular Dividend
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 1,480,022 |  |  | $ 995 |  | $ 1,129,435 |  | $ 277,592 |  |
Beginning Balance (in shares) at Dec. 31, 2011 |  |  |  | 99,528 |  |  |  |  |  |
Net income | 69,014 |  |  |  |  |  |  | 69,014 |  |
Issuance of common stock | 12 |  |  |  |  | 12 |  |  |  |
Retirement of common stock (in shares) |  |  |  | (100) |  |  |  |  |  |
Retirement of common stock | (2,481) |  |  | (1) |  | (2,480) |  |  |  |
Dividend on common stock |  |  | (20,060) |  |  |  |  |  |  | (20,060)
Restricted stock compensation, net of forfeitures (in shares) |  |  |  | (7) |  |  |  |  |  |
Restricted stock compensation, net of forfeitures | 3,576 |  |  |  |  | 3,576 |  |  |  |
Income tax benefit of equity compensation | 2,094 |  |  |  |  | 2,094 |  |  |  |
Stock option compensation expense, net of forfeitures | 2,315 |  |  |  |  | 2,315 |  |  |  |
Restricted stock grant (in shares) |  |  |  | 332 |  |  |  |  |  |
Restricted stock grant |  |  |  | 3 |  | (3) |  |  |  |
Stock options exercised (in shares) |  |  |  | 224 |  |  |  |  |  |
Stock options exercised | 2,078 |  |  | 3 |  | 2,075 |  |  |  |
Ending Balance at Jun. 30, 2012 | 1,464,570 |  |  | 1,000 |  | 1,137,024 |  | 326,546 |  |
Ending Balance (in shares) at Jun. 30, 2012 |  |  |  | 99,977 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2012 | 1,521,620 |  |  | 1,001 |  | 1,146,488 |  | 374,131 |  |
Beginning Balance (in shares) at Dec. 31, 2012 |  |  |  | 100,105 |  |  |  |  |  |
Net income | 201,521 |  |  |  |  |  |  | 201,521 |  |
Issuance of common stock (in shares) |  |  |  | 19 |  |  |  |  |  |
Issuance of common stock | 13 |  |  |  |  | 13 |  |  |  |
Retirement of common stock (in shares) |  |  |  | (144) |  |  |  |  |  |
Retirement of common stock | (5,454) |  |  | (1) |  | (5,453) |  |  |  |
Dividend on common stock (in shares) |  |  |  |  | 13,878 |  |  |  |  |
Dividend on common stock |  | (135,546) | (109,488) |  | 139 |  | 542,541 |  | (678,226) | (109,488)
Restricted stock compensation, net of forfeitures (in shares) |  |  |  | (12) |  |  |  |  |  |
Restricted stock compensation, net of forfeitures | 4,721 |  |  |  |  | 4,445 |  | 276 |  |
Income tax benefit of equity compensation | 31 |  |  |  |  | 31 |  |  |  |
Stock option compensation expense, net of forfeitures | 1,677 |  |  |  |  | 1,677 |  |  |  |
Restricted stock grant (in shares) |  |  |  | 300 |  |  |  |  |  |
Restricted stock grant |  |  |  | 3 |  | (3) |  |  |  |
Stock options exercised (in shares) |  |  |  | 1,272 |  |  |  |  |  |
Stock options exercised | 22,094 |  |  | 12 |  | 22,082 |  |  |  |
Ending Balance at Jun. 30, 2013 | $ 1,501,189 |  |  | $ 1,154 |  | $ 1,711,821 |  | $ (211,786) |  |
Ending Balance (in shares) at Jun. 30, 2013 |  |  |  | 115,418 |  |  |  |  |  |

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