with a grant date fair value of $2.0 million, recognized over three years, with remaining unearned compensation of $0.3 million. No stock options vested during years ended December 31, 2019, 2018 or 2017. Information related to stock options issued to officers, other employees and directors under all plans is presented in the following table: 2019 2018 2017 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Number of shares under option: Outstanding — beginning of year 114,943 $ 48.63 114,943 $ 48.63 — $ — Granted — — — — 114,943 48.63 Exercised — — — — — — Canceled — — — — — — Outstanding — end of year 114,943 $ 48.63 114,943 $ 48.63 114,943 $ 48.63 Exercisable — end of year — $ — — $ — — $ — The weighted average remaining contractual life of options outstanding at December 31, 2019 and 2018 was 7.3 years and 8.3 years, respectively. Restricted Shares  — Generally, the restrictions on Restricted Shares do not expire for a minimum of one year and a maximum of three years, and shares are subject to forfeiture during the restriction period. Most typically, Restricted Share grants have staggered vesting periods over one to three years from grant date. The intrinsic value of the Restricted Shares, which is typically the product of share price at the date of grant and the number of Restricted Shares granted, is amortized on a straight-line basis to compensation expense over the periods in which the restrictions lapse. Awards of Restricted Shares are valued at the closing market price of our common stock on the date of grant. The unearned compensation is amortized to compensation expense over the vesting period of the Restricted Shares, except for awards related to the 55/10 Provision which are expensed when granted. As of December 31, 2019 and 2018, we had $23.4 million and $24.3 million, respectively, of unearned compensation cost related to unvested Restricted Shares, which is expected to be recognized over a weighted-average period of approximately one year. The total fair value of Restricted Shares vested during the years ended December 31, 2019, 2018 and 2017 was $16.8 million, $14.3 million and $30.5 million, respectively. We recorded stock-based compensation for Restricted Shares as follows: Year Ended December 31, 2019 2018 2017 (Amounts in millions) Stock-based compensation expense $ 23.9 $ 19.9 $ 22.8 Related income tax benefit (5.4) (4.5) (5.2) Net stock-based compensation expense $ 18.5 $ 15.4 $ 17.6 76