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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Capital Stock | We have authorized capital stock of 485.0 million shares, which includes 475.0 million shares of common stock and 10.0 million shares of preferred stock. The following is a schedule of changes in the number of common shares outstanding since the beginning of 2013:
| Year Ended December 31, |
| 2015 |  |  | 2014 |  |  | 2013 |
Beginning balance |  | 168,628,177 |  |  |  | 163,342,894 |  |  |  | 162,514,098 |
Equity offering |  | − |  |  |  | 4,560,000 |  |  |  | − |
Stock options/SARs exercised |  | 77,002 |  |  |  | 195,242 |  |  |  | 278,916 |
Restricted stock grants |  | 335,103 |  |  |  | 270,062 |  |  |  | 401,122 |
Restricted stock units vested |  | 252,507 |  |  |  | 244,413 |  |  |  | 119,480 |
Treasury shares |  | 23,671 |  |  |  | 15,566 |  |  |  | 29,278 |
Ending balance |  | 169,316,460 |  |  |  | 168,628,177 |  |  |  | 163,342,894 |

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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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