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Stock-based Compensation Plans Performance-based share units (Policies) | 3 Months Ended
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Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] | The PSUs vest over a period of four years following the date of grant, and 25% of the grant is earned or forfeited on each grant anniversary date, subject to certification of the performance criteria by the Compensation Committee of the Board of Directors. The number of units that actually vest will be determined for each year based on the achievement of certain Company performance criteria set forth in the award agreement and may range from zero to 200% of the annual target grant. PSUs that do not vest based on failure to satisfy the stated performance criteria for any annual period are forfeited. In addition to the satisfaction of the performance criteria for the PSUs, vesting is dependent upon continued service with forfeiture of all unvested PSUs upon termination, unless in the case of death or disability, in which case a pro rata portion of the target number of PSUs are eligible to immediately vest based on actual performance during the performance period. The PSUs are settled in shares of common stock. Holders will receive one share of common stock for each performance-based share unit that vests. The fair value of PSUs is based on the closing price of the Company’s common stock on the grant date. Compensation expense for PSUs is recognized over the vesting period when it is probable the performance criteria will be achieved.

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- Definition Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2228939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 06-11 -Paragraph 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(f) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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