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Equity-Based Compensation (Tables)
6 Months Ended
Jun. 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 460 8.05
Forfeited (37) 15.49
Vested (107) 16.98
Non-vested shares at June 30, 2015 723 $ 12.04
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 (73) 19.86
Vested (97) 17.61
Non-vested units at June 30, 2015 928 $ 14.55
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