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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders' Equity Preferred and Preference Stock We have two classes of preferred stock issued and outstanding: the 4% Preferred Stock (the Preferred Stock) and the $2.12 Preference Stock (the Preference Stock). The Preferred Stock is entitled to cumulative dividends of $2 per year and can be converted into 24.24 shares of common stock, subject to adjustment, in certain events. The Preferred Stock is redeemable at our option at a price of $50 per share, plus dividends accrued through the redemption date. We are authorized to issue 600,000 shares of Preferred Stock. At December 31, 2015 and 2014, there were 12 shares and 24 shares outstanding, respectively. There are no unpaid dividends in arrears. The Preference Stock is entitled to cumulative dividends of $2.12 per year and can be converted into 16.53 shares of common stock, subject to adjustment, in certain events. The Preference Stock is redeemable at our option at a price of $28 per share. We are authorized to issue 5,000,000 shares of Preference Stock. At December 31, 2015 and 2014, there were 18,660 shares and 20,237 shares outstanding, respectively. There are no unpaid dividends in arrears. Common and Treasury Stock 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 |
At December 31, 2015, 35,377,289 shares were reserved for issuance under our stock plans, dividend reinvestment program and the conversion of Preferred Stock and Preference Stock.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 12: 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 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C + Details
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