Common Stock Price Vested Common Stock Price Unvested Share Based Payment Award Options Vested Number Of Shares Tax Benefit Yearover year change in fair value of outstanding unvested equity awards [Member] Fair value at vesting date of equity awards granted and vested in the same year [Member] Yearover year change in fair value of equity awards granted in prior years that vested in the same year [Member] Fair value at the end of the prior year of equity awards forfeited in the year [Member] Dividends paid on equity awards in current year prior to vesting( [Member] Reported value of equity awards [Member] Yearend fair value of outstanding and unvested equity awards granted in the year [Member]