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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Note [Abstract] |
Schedule of Stockholders Equity | The following table summarizes the changes in shares of Common Stock outstanding and Treasury Stock:
| Common Stock Outstanding |  | Treasury Stock
Balance at December 31, 2012 | 200,884,047 |  |  | 122,453,865 |
Issuance of common stock | 1,163,668 |  |  | (1,163,668 | )
Conversions to common stock | 34,807 |  |  | (34,807 | )
Balance at December 31, 2013 | 202,082,522 |  |  | 121,255,390 |
Repurchases of common stock | (1,863,262 | ) |  | 1,863,262 |
Issuance of common stock | 781,032 |  |  | (781,032 | )
Conversions to common stock | 27,672 |  |  | (27,672 | )
Balance at December 31, 2014 | 201,027,964 |  |  | 122,309,948 |
Repurchases of common stock | (6,476,796 | ) |  | 6,476,796 |
Issuance of common stock | 943,686 |  |  | (943,686 | )
Conversions to common stock | 26,354 |  |  | (26,354 | )
December 31, 2015 | 195,521,208 |  |  | 127,816,704 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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