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Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
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 (Loss) per Share | The following table presents information necessary to calculate net income (loss) per share for the years ended December 31, 2016, 2015 and 2014, 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):
|  | 2016 |  |  | 2015 |  |  | 2014 |
BASIC EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | (318,634 | ) |  | $ | (294,486 | ) |  | $ | 162,664 |
Adjust for (income) loss attributed to holders of non-vested restricted stock |  |  | — |  |  |  | 3,022 |  |  |  | (1,663 | )
Income (loss) attributed to common stockholders |  | $ | (318,634 | ) |  | $ | (291,464 | ) |  | $ | 161,001 |
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 146,178 |  |  |  | 145,416 |  |  |  | 144,066 |
Basic net income (loss) per common share |  | $ | (2.18 | ) |  | $ | (2.00 | ) |  | $ | 1.12 |
DILUTED EPS: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributed to common stockholders |  | $ | (318,634 | ) |  | $ | (291,464 | ) |  | $ | 161,001 |
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock |  |  | 146,178 |  |  |  | 145,416 |  |  |  | 144,066 |
Add dilutive effect of potential common shares |  |  | — |  |  |  | — |  |  |  | 1,310 |
Weighted average number of diluted common shares outstanding |  |  | 146,178 |  |  |  | 145,416 |  |  |  | 145,376 |
Diluted net income (loss) per common share |  | $ | (2.18 | ) |  | $ | (2.00 | ) |  | $ | 1.11 |
Potentially dilutive securities excluded as anti-dilutive |  |  | 9,057 |  |  |  | 7,781 |  |  |  | 1,088 |

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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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