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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2014
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, 2014 and 2013, there were 24 shares and 74 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, 2014 and 2013, there were 20,237 shares and 21,838 shares outstanding, respectively. There are no unpaid dividends in arrears. Common and Treasury Stock The following table summarizes the changes in Common Stock and Treasury Stock:
| Common Stock |  | Treasury Stock
Balance at December 31, 2011 | 199,751,070 |  |  | 123,586,842 |
Issuance of common stock | 1,118,089 |  |  | (1,118,089 | )
Conversions to common stock | 14,888 |  |  | (14,888 | )
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 |
At December 31, 2014, 37,568,025 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 S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 3: 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 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 8: 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 9: 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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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 S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 14: 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 15: 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 16: 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 17: 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 18: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 19: 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 + Details
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