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Capital Stock (Tables) | 6 Months Ended
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Jun. 30, 2017
Equity [Abstract] |
Capital Stock | The following is a schedule of changes in the number of common shares outstanding since the beginning of 2016:
|  | Six Months Ended June 30, 2017 |  |  | Year Ended December 31, 2016 |
Beginning balance |  |  | 247,144,356 |  |  |  | 169,316,460 |
MRD Merger |  |  | — |  |  |  | 77,042,749 |
Restricted stock grants |  |  | 534,686 |  |  |  | 490,609 |
Restricted stock units vested |  |  | 335,487 |  |  |  | 266,541 |
PSU-TSR units settled |  |  | 85,461 |  |  |  | — |
Shares retired |  |  | — |  |  |  | (739 | )
Treasury shares issued |  |  | 15,580 |  |  |  | 28,736 |
Ending balance |  |  | 248,115,570 |  |  |  | 247,144,356 |

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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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