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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Capital Stock | The following is a schedule of changes in the number of common shares outstanding since the beginning of 2016:
| Year Ended December 31, |
| 2018 |  |  | 2017 |  |  | 2016 |
Beginning balance |  | 248,129,430 |  |  |  | 247,144,356 |  |  |  | 169,316,460 |
MRD Merger |  | — |  |  |  | — |  |  |  | 77,042,749 |
Restricted stock grants |  | 865,095 |  |  |  | 539,096 |  |  |  | 490,609 |
Restricted stock units vested |  | 434,046 |  |  |  | 344,937 |  |  |  | 266,541 |
Performance stock units issued |  | 76,149 |  |  |  | 85,461 |  |  |  | — |
Shares retired |  | — |  |  |  | — |  |  |  | (739 | )
Treasury shares |  | 5,302 |  |  |  | 15,580 |  |  |  | 28,736 |
Ending balance |  | 249,510,022 |  |  |  | 248,129,430 |  |  |  | 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://fasb.org/us-gaap/role/ref/legacyRef -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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