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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Estimated Useful Lives of Property and Equipment | The estimated useful lives, in years, are shown below:
|  | Useful Lives |
Drilling rigs and other equipment |  |  | 1.25-15 |
Buildings |  |  | 15-20 |
Other |  |  | 3-12 |
Calculation of Income Per Share From Continuing and Discontinued Operations | The following table presents information necessary to calculate income from continuing operations per share, loss from discontinued operations per share and net income per share for the years ended December 31, 2012, 2011 and 2010, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive (in thousands, except per share amounts):
|  | 2012 |  |  | 2011 |  |  | 2010 |
BASIC EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 299,477 |  |  | $ | 322,780 |  |  | $ | 117,898 |
Adjust for income attributed to holders of non-vested restricted stock |  |  | (2,532 | ) |  |  | (2,545 | ) |  |  | (884 | )
Income from continuing operations attributed to common stockholders |  | $ | 296,945 |  |  | $ | 320,235 |  |  | $ | 117,014 |
Loss from discontinued operations, net |  | $ | — |  |  | $ | (367 | ) |  | $ | (956 | )
Adjust for loss attributed to holders of non-vested restricted stock |  |  | — |  |  |  | 3 |  |  |  | 7 |
Loss from discontinued operations attributed to common stockholders |  | $ | — |  |  | $ | (364 | ) |  | $ | (949 | )
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 151,144 |  |  |  | 153,871 |  |  |  | 152,772 |
Basic income from continuing operations per common share |  | $ | 1.96 |  |  | $ | 2.08 |  |  | $ | 0.77 |
Basic loss from discontinued operations per common share |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | (0.01 | )
Basic net income per common share |  | $ | 1.96 |  |  | $ | 2.08 |  |  | $ | 0.76 |
DILUTED EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributed to common stockholders |  | $ | 296,945 |  |  | $ | 320,235 |  |  | $ | 117,014 |
Add incremental earnings related to potential common shares |  |  | — |  |  |  | — |  |  |  | — |
Adjusted income from continuing operations attributed to common stockholders |  | $ | 296,945 |  |  | $ | 320,235 |  |  | $ | 117,014 |
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 151,144 |  |  |  | 153,871 |  |  |  | 152,772 |
Add dilutive effect of potential common shares |  |  | 555 |  |  |  | 1,433 |  |  |  | 504 |
Weighted average number of diluted common shares outstanding |  |  | 151,699 |  |  |  | 155,304 |  |  |  | 153,276 |
Diluted income from continuing operations per common share |  | $ | 1.96 |  |  | $ | 2.06 |  |  | $ | 0.76 |
Diluted loss from discontinued operations per common share |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | (0.01 | )
Diluted net income per common share |  | $ | 1.96 |  |  | $ | 2.06 |  |  | $ | 0.76 |
Potentially dilutive securities excluded as anti-dilutive |  |  | 5,416 |  |  |  | 1,641 |  |  |  | 4,164 |

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