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Incentive Based Compensation (Details 2-Restricted) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Restricted Stock  
Beginning year unvested restricted stock 3,448,353
Granted restricted stock 2,668,357
Vested restricted stock (921,404)
Forfeited restricted stock (491,739)
End of period unvested restricted stock 4,703,567
Beginning year weighted average grant date fair value unvested restricted stock $ 34.04
Granted restricted stock weighted average grant date fair value restricted stock 30.53
Vested restricted stock weighted average grant date fair value restricted stock 34.29
Forfeited restricted stock weighted average grant date fair value restricted stock 33.70
End of period weighted average grant date fair value unvested restricted stock $ 32.04