the remaining unrecognized pre-tax compensation cost related to performance share awards at december 31 , 2017 was approximately $ 6.8 million , and the weighted-average period of time over which this cost will be recognized is 1.3 years . the fair value of performance share awards that vested during 2017 was $ 5.6 million ( 100580 shares ) . director awards stock awards are used as part of the compensation provided to outside directors under the plan . awards are issued annually in the second quarter