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Stockholders' Equity | 9 Months Ended
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Sep. 30, 2013
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | (3) Stockholders’ Equity Our authorized, issued, and outstanding shares (share amounts stated in whole numbers) consist of the following:
| Par Value |  | September 30, 2013 |  | December 31, 2012 |  | September 30, 2012
Preferred Stock | $.01 | /share |  |  |  |  |  |
Shares authorized |  |  | 5,000,000 |  |  | 5,000,000 |  |  | 5,000,000 |
Shares issued and outstanding |  |  | — |  |  | — |  |  | — |
Common Stock | $.01 | /share |  |  |  |  |  |
Shares authorized |  |  | 400,000,000 |  |  | 400,000,000 |  |  | 400,000,000 |
Shares issued and outstanding |  |  | 296,742,069 |  |  | 296,564,382 |  |  | 296,307,832 |
Dividends On October 8, 2013, our board of directors declared a dividend of $0.25 per share of common stock. This dividend is to be paid in cash on November 22, 2013 to shareholders of record at the close of business on October 25, 2013. Since 2011 we have paid quarterly dividends and, in 2012, we paid a supplemental dividend late in the year due to uncertainty related to future dividend tax rates in the United States. Our board of directors expects to continue paying quarterly dividends, provided the future determination as to payment of dividends will depend on the financial needs of the Company and such other factors as deemed relevant by the board of directors. The following table presents the dividends either paid previously or declared by our board of directors for future payment:
| 2013 |  | 2012
First quarter | $ | 0.10 |  |  | $ | 0.17 |
Second quarter | 0.20 |  |  | 0.17 |
Third quarter | 0.25 |  |  | 0.19 |
Fourth quarter | 0.25 |  |  | 0.21 |
Sub-Total | $ | 0.80 |  |  | $ | 0.74 |
Supplemental |  |  |  | 0.50 |
Total | $ | 0.80 |  |  | $ | 1.24 |
Stock Options The following tables summarize the details of grants made under our stock option plan of options that have been granted and are outstanding, and the assumptions used to value these options. All options granted were effective at the close of business on the date of grant.
|  |  | Option |  | Closing |  |  |  |
|  |  | exercise |  | stock price |  | September 30, 2013
| Options |  | (strike) |  | on date |  | Options |  | Options
Date of grant | granted |  | price |  | of grant |  | outstanding |  | vested
April 16, 2013 | 205,000 |  |  | $ | 54.00 |  |  | $ | 49.25 |  |  | 177,500 |  |  | — |
April 17, 2012 | 1,235,000 |  |  | $ | 54.00 |  |  | $ | 49.01 |  |  | 1,132,500 |  |  | — |
April 19, 2011 | 410,000 |  |  | $ | 35.00 |  |  | $ | 31.78 |  |  | 360,000 |  |  | — |
April 20, 2010 | 530,000 |  |  | $ | 30.00 |  |  | $ | 27.13 |  |  | 300,000 |  |  | — |
April 21, 2009 | 790,000 |  |  | $ | 27.00 |  |  | $ | 17.61 |  |  | 413,600 |  |  | 173,600 |
April 15, 2008 | 550,000 |  |  | $ | 27.00 |  |  | $ | 24.35 |  |  | 216,000 |  |  | 114,750 |
April 17, 2007 | 4,380,000 |  |  | $ | 22.50 |  |  | $ | 20.15 |  |  | 1,796,005 |  |  | 1,126,505 |
Total | 8,100,000 |  |  |  |  |  |  | 4,395,605 |  |  | 1,414,855 |
Date of grant | Risk-free interest rate |  | Expected life of option in years |  | Expected dividend yield |  | Expected stock volatility |  | Estimated fair value of stock option
April 16, 2013 | 0.7 | % |  | 5.00 |  | 1.6 | % |  | 37.42 | % |  | $ | 12.66 |
April 17, 2012 | 0.9 | % |  | 5.00 |  | 1.4 | % |  | 39.25 | % |  | $ | 13.69 |
April 19, 2011 | 2.1 | % |  | 5.00 |  | 1.6 | % |  | 39.33 | % |  | $ | 11.20 |
April 20, 2010 | 2.6 | % |  | 5.00 |  | 1.5 | % |  | 39.10 | % |  | $ | 8.14 |
April 21, 2009 | 1.9 | % |  | 5.00 |  | 1.0 | % |  | 38.80 | % |  | $ | 3.64 |
April 15, 2008 | 2.7 | % |  | 5.00 |  | 1.0 | % |  | 30.93 | % |  | $ | 7.75 |
April 17, 2007 | 4.6 | % |  | 4.85 |  | 1.0 | % |  | 31.59 | % |  | $ | 5.63 |
All of the options in the tables above vest and become exercisable over a period of up to eight years. Each option will terminate, to the extent not previously exercised, 13 months after the end of the relevant vesting period. The fair value of each share-based option is estimated on the date of grant using a Black-Scholes valuation method that uses the assumptions listed above. The expected life is the average length of time over which we expect the employee groups will exercise their options, which is based on historical experience with similar grants. Expected volatilities are based on the movement of our stock over the most recent historical period equivalent to the expected life of the option. The risk-free interest rate is based on the U.S. Treasury rate over the expected life at the time of grant. The dividend yield is estimated over the expected life based on our current dividend payout, historical dividends paid, and expected future cash dividends. Compensation expense equal to the grant date fair value is recognized for all of these awards over the vesting period. The stock-based compensation expense for the nine month periods ended September 30, 2013 and 2012 was $4,050 and $3,450, respectively. Unrecognized compensation expense related to outstanding stock options as of September 30, 2013 was $17,273 and is expected to be recognized over a weighted average period of 4.92 years. Any future changes in estimated forfeitures will impact this amount. Earnings Per Share The following tables present a reconciliation of the denominators used in the computation of basic and diluted earnings per share and a summary of the options to purchase shares of common stock which were excluded from the diluted earnings calculation because they were anti-dilutive:
| Nine-month period |  | Three-month period
Reconciliation | 2013 |  | 2012 |  | 2013 |  | 2012
Basic weighted average shares outstanding | 296,755,815 |  |  | 295,964,359 |  |  | 296,842,771 |  |  | 296,237,956 |
Weighted shares assumed upon exercise of stock options | 945,509 |  |  | 1,119,341 |  |  | 873,604 |  |  | 940,790 |
Diluted weighted average shares outstanding | 297,701,324 |  |  | 297,083,700 |  |  | 297,716,375 |  |  | 297,178,746 |
| Nine-month period |  | Three-month period
Summary of anti-dilutive options excluded | 2013 |  | 2012 |  | 2013 |  | 2012
Options to purchase shares of common stock | 1,263,599 |  |  | 735,675 |  |  | 1,313,261 |  |  | 1,578,804 |
Weighted average exercise price of options | $54.00 |  | $54.00 |  | $54.00 |  | $49.43
Any dilutive impact summarized above would relate to periods when the average market price of our stock exceeded the exercise price of the potentially dilutive option securities then outstanding.

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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 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 2: 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 3: 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 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 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 9: 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 10: 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 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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