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Equity-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2015
Equity-Based Compensation  
Summary of restricted stock and restricted stock unit award activity
Weighted-Average Grant-Date Fair Value
Number
(per share)
Non-vested shares at January 1, 2015 407 $ 18.14
Granted 487 $ 7.83
Forfeited (43)$ 15.33
Vested (109)$ 17.01
Non-vested shares at September 30, 2015 742 $ 11.71
Summary of performance based share unit awards activity
Weighted-Average Grant-Date Fair Value
Number
(per share)
Non-vested units at January 1, 2015 497 $ 21.84
Granted 601 $ 9.66
Forfeited (88)$ 18.79
Vested (97)$ 17.61
Non-vested units at September 30, 2015 913 $ 14.57
Summary of assumptions used to estimate the fair value of the performance-based share units
Risk-free interest rate 1.0 %
Expected volatility 37.7 %
Term2.8 years
Fair value (per share)$9.66