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Equity-Based Compensation
 3 Months Ended
Mar. 31, 2013
Equity-Based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Equity-Based Compensation
The Company recognized $1.9 million and $5.7 million in equity-based compensation expense for the three months ended March 31, 2013 and 2012, respectively. Equity-based compensation expense for the three months ended March 31, 2012 included incremental expense of $1.6 million related to a modified Class B Common Unit grant agreement with the Company's former chief executive officer, which was entered into in June 2011.
The following table sets forth the summary of equity plan activity for the three months ended March 31, 2013:
Equity Awards
Class B
Common Units (1)
 
 
MPK Plan
Units (1) (2)
 
Outstanding at January 1, 2013
216,483

 
 
66,137

  
Granted
400

 
 
—

  
Forfeited
(665
)
 
 
(1,534
)
(3)  
Repurchased/Settled
(126
)
(4 
) 
 
(482
)
(4)  
Outstanding at March 31, 2013
216,092

 
 
64,121

  
Vested at March 31, 2013
125,903

 
 
112

(5)  
(1)
The weighted-average grant date fair market value for Class B Common Units granted during the period ended March 31, 2013 is $119.00. The weighted-average grant date fair market value for outstanding Class B Common Units inclusive of the $60.00 per unit impact of the March 2010 modification and the impact of the June 2011 modification for the Company's former chief executive officer is $279.58. The weighted-average grant date fair market value for outstanding MPK Plan Units is $1,000.
(2)
Represents units notionally credited to participants' accounts.
(3)
The Company contributes the fair market value of awards forfeited under the plan to a charitable foundation. The contribution is generally made in the quarter following that in which the units are forfeited. As of March 31, 2013, the Company owed a contribution of 1,534 units.
(4)
Represents Class B Common Units that were repurchased by the Company from former participants and the settlement of vested MPK Plan Units through the issuance of Class A Common Units in exchange for the vested MPK Plan Units.
(5)
Represents MPK Plan Units that have vested but not yet converted to Class A Common Units.
As of March 31, 2013, the total unrecognized compensation cost of $28.5 million related to nonvested equity-based compensation awards granted under the equity plans is expected to be recognized over the weighted-average period of 4.3 years. As discussed in Note 1, on March 22, 2013, the Company filed a Registration Statement on Form S-1 with the SEC relating to the proposed initial public offering of its common shares. In the event of an initial public offering of the Company's shares, the vesting of certain equity awards will accelerate, resulting in the acceleration of the related compensation expense during the period such event occurs.