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Equity Based Compensation (Notes)
 6 Months Ended
Jun. 30, 2013
Share-based Compensation [Abstract]  
Stock Based Compensation
Equity Based Compensation
We incurred $0.1 million of unit-based compensation expense related to the Partnership during the three and six months ended June 30, 2013. The fair value of our phantom units is determined based on the closing price of our common limited partner units on the grant date. The estimated fair value of our phantom units is amortized over the vesting period using the straight line method. Awards vest over a five-year service period. As of June 30, 2013, there was $1.0 million of total unrecognized compensation cost related to non-vested equity-based compensation arrangements, which is expected to be recognized over a weighted-average period of 4.5 years.
Sponsor's Stock-Based Compensation
Certain employees supporting the Predecessor's operations received long-term incentive compensation that is part of the Delek US Holdings, Inc. 2006 Long-Term Incentive Plan, as amended (the “2006 Plan”). The 2006 Plan allows Delek to grant stock options, stock appreciation rights ("SARs"), restricted stock units and other stock-based awards denominated in shares of Delek's common stock to certain directors, officers, employees, consultants and other individuals who perform services for Delek or its affiliates, including these employees. Delek uses the Black-Scholes-Merton option-pricing model to determine the fair value of stock option and stock appreciation right awards, with the exception of the SARs granted to certain executive employees, which are valued under the Monte-Carlo simulation model. Restricted stock units are measured based on the fair market value of the underlying stock on the date of grant. Compensation expense related to stock-based awards is generally recognized with graded or cliff vesting on a straight-line basis over the vesting period.
Certain Delek employees supporting the Predecessor's operations were historically granted these types of awards. These costs were recorded as compensation expense and additional paid-in capital and totaled a nominal amount related to the Predecessor's employees for the three and six months ended June 30, 2012. The Predecessor recognized additional compensation expense related to equity-based compensation awards to related party employees of $0.2 million and $0.3 million for the three and six months ended June 30, 2012 for allocated related party services and an allocation of director and executive officer equity-based compensation.
As of June 30, 2012, there was $0.5 million of total unrecognized compensation cost related to non-vested equity-based compensation arrangements for the Predecessor's employees, which was expected to be recognized over a weighted-average period of 3.0 years. Subsequent to the Offering, these costs are allocated to the Partnership as part of the administrative fees under the omnibus agreement.