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Capital Stock (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Capital Stock | The following is a schedule of changes in the number of common shares outstanding since the beginning of 2017:
|  | Three Months Ended March 31, 2018 |  |  | Year Ended December 31, 2017 |
Beginning balance |  |  | 248,129,430 |  |  |  | 247,144,356 |
Restricted stock grants |  |  | 673,791 |  |  |  | 539,096 |
Restricted stock units vested |  |  | 397,774 |  |  |  | 344,937 |
Performance stock units issued |  |  | 20,430 |  |  |  | 85,461 |
Treasury shares issued |  |  | 895 |  |  |  | 15,580 |
Ending balance |  |  | 249,222,320 |  |  |  | 248,129,430 |

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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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