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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
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 Basic and Diluted Net Income per Share | The following table presents information necessary to calculate income from continuing operations per share and net income per share for the years ended December 31, 2014, 2013 and 2012, 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):
|  | 2014 |  |  | 2013 |  |  | 2012 |
BASIC EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 162,664 |  |  | $ | 188,009 |  |  | $ | 299,477 |
Adjust for income attributed to holders of non-vested restricted stock |  |  | (1,663 | ) |  |  | (1,859 | ) |  |  | (2,532 | )
Income attributed to common stockholders |  | $ | 161,001 |  |  | $ | 186,150 |  |  | $ | 296,945 |
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 144,066 |  |  |  | 144,356 |  |  |  | 151,144 |
Basic net income per common share |  | $ | 1.12 |  |  | $ | 1.29 |  |  | $ | 1.96 |
DILUTED EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income attributed to common stockholders |  | $ | 161,001 |  |  | $ | 186,150 |  |  | $ | 296,945 |
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 144,066 |  |  |  | 144,356 |  |  |  | 151,144 |
Add dilutive effect of potential common shares |  |  | 1,310 |  |  |  | 947 |  |  |  | 555 |
Weighted average number of diluted common shares outstanding |  |  | 145,376 |  |  |  | 145,303 |  |  |  | 151,699 |
Diluted income per common share |  | $ | 1.11 |  |  | $ | 1.28 |  |  | $ | 1.96 |
Potentially dilutive securities excluded as anti-dilutive |  |  | 1,088 |  |  |  | 2,447 |  |  |  | 5,416 |

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- Definition Estimated useful lives of property plant and equipment. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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