Number of Shares | Weighted Average Grant Date Fair Value | |||||||
Outstanding and non-vested, December 31, 2015 | 13,611,270 | $ | 9.32 | |||||
Granted | 2,301,115 | 4.74 | ||||||
Vested | (3,248,800 | ) | 9.19 | |||||
Forfeited | (50,000 | ) | 7.80 | |||||
Outstanding and non-vested, December 31, 2016 | 12,613,585 | 8.52 | ||||||
Granted | 10,922,799 | 3.09 | ||||||
Vested | (4,236,973 | ) | 8.99 | |||||
Forfeited | (45,000 | ) | 7.59 | |||||
Outstanding and non-vested, December 31, 2017 | 19,254,411 | $ | 5.34 |