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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Capital Stock | The following is a schedule of changes in the number of common shares outstanding since the beginning of 2015:
| Year Ended December 31, |
| 2017 |  |  | 2016 |  |  | 2015 |
Beginning balance |  | 247,144,356 |  |  |  | 169,316,460 |  |  |  | 168,628,177 |
MRD Merger |  | — |  |  |  | 77,042,749 |  |  |  | — |
Stock options/SARs exercised |  | — |  |  |  | — |  |  |  | 77,002 |
Restricted stock grants |  | 539,096 |  |  |  | 490,609 |  |  |  | 335,103 |
Restricted stock units vested |  | 344,937 |  |  |  | 266,541 |  |  |  | 252,507 |
Performance stock units issued |  | 85,461 |  |  |  | — |  |  |  | — |
Shares retired |  | — |  |  |  | (739 | ) |  |  | — |
Treasury shares |  | 15,580 |  |  |  | 28,736 |  |  |  | 23,671 |
Ending balance |  | 248,129,430 |  |  |  | 247,144,356 |  |  |  | 169,316,460 |

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- Definition Tabular disclosure of an entity's capital units or capital shares, including the value of capital units or capital shares, units authorized, units outstanding and other information necessary to a fair presentation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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