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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Stock-Based Compensation The following table summarizes the Company's pre-tax compensation expense and related income tax benefit during the three and nine months ended September 30, 2013 and 2012 related to the Company's performance units and restricted stock.
| Three Months Ended | Nine Months Ended
| September 30, | September 30,
(In millions) | 2013 | 2012 | 2013 | 2012
Performance units |  |  |  |
Total shareholder return | $ | 2.5 |  | $ | 1.9 |  | $ | 6.4 |  | $ | 5.7 |
Earnings per share | 0.6 |  | 0.7 |  | 1.9 |  | 2.0 |
Total performance units | 3.1 |  | 2.6 |  | 8.3 |  | 7.7 |
Restricted stock | 0.1 |  | 0.1 |  | 0.3 |  | 0.5 |
Total compensation expense | 3.2 |  | 2.7 |  | 8.6 |  | 8.2 |
Less: Amount paid by unconsolidated affiliates | 1.4 |  | — |  | 2.0 |  | — |
Net compensation expense | $ | 1.8 |  | $ | 2.7 |  | $ | 6.6 |  | $ | 8.2 |
Income tax benefit | $ | 0.7 |  | $ | 1.0 |  | $ | 2.6 |  | $ | 3.2 |
The Company has issued new shares to satisfy stock option exercises, restricted stock grants and payouts of earned performance units. During the three and nine months ended September 30, 2013, there were 292 shares forfeited and 549,228 shares of new common stock issued, respectively, pursuant to the Company's stock incentive plans related to exercised stock options, restricted stock grants (net of forfeitures) and payouts of earned performance units. During the nine months ended September 30, 2013, there were 125,264 of treasury stock shares issued. During the three and nine months ended September 30, 2013, there were 4,038 shares and 10,512 shares of restricted stock, respectively, returned to the Company to satisfy tax liabilities. The Company received $1.4 million during the nine months ended September 30, 2013 related to exercised stock options. The Company did not realize an income tax benefit for the tax deductions from the exercised stock options during the three and nine months ended September 30, 2013 due to the Company being in a tax net operating loss position in 2013. As a result of the formation of Enable Midstream Partners on May 1, 2013, 50 percent of OGE Holdings' 2013 performance unit grants that were previously based on earnings before interest, taxes, depreciation and amortization were converted to stock-based compensation. The performance unit grants converted totaled 91,390, which is comprised of 45,596 total shareholder return performance units with a $25.89 grant date fair value and 45,794 earnings per share performance units with a $26.73 grant date fair value. As a result of a modification to the 2012 performance unit grants, 50 percent of OGE Holdings' 2012 performance unit grants that were previously based on earnings before interest, taxes and depreciation and amortization were converted to stock-based compensation. The performance unit grants converted totaled 82,400 , which is comprised of 41,288 total shareholder return performance units with a $47.71 grant date fair value and 41,112 earnings per share performance units with a $34.94 grant date fair value. The amount of these performance units were adjusted for the effects of the stock split. The impact of the modification of the performance unit grants on stock-based compensation expense for the three and nine months ended September 30, 2013 was not material.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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