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Long-Term Incentive Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of changes in non-vested restricted shares
A summary of the changes in our non-vested restricted shares for the nine months ended September 30, 2015 is presented below:
 
 
Number of Shares
 
Weighted Average
Grant Date Fair Value
per Share
 
Non-vested at December 31, 2014
 
1,033,394

 
$
19.80

 
Granted
 
3,628,479

 
9.46

 
Vested
 
(331,682
)
 
19.63

 
Forfeited
 
(363,536
)
 
12.05

 
Non-vested at September 30, 2015
 
3,966,655

 
$
11.07