Difference in Fair Values Between Prior Year-End Fair Values and Vest Date Fair Values for Awards Granted in Prior Years [Member] Difference in fair values between prior year-end fair values and vest date fair values for awards granted in prior years. Dividends or Dividend Equivalents not Otherwise Included in Total Compensation [Member] Dividends or dividend equivalents not otherwise included in total compensation. Fair Values at Vest Date for Awards Granted and Vested in Current Year [Member] Fair values at vest date for awards granted and vested in current year. Forfeitures During Current Year Equal to Prior Year-End Fair Value [Member] Forfeitures during current year equal to prior year-end fair value. Grant Date Values in the Summary Compensation Table [Member] Grant date values in the summary compensation table. Year-End Fair Value of Unvested Awards Granted in the Current Year [Member] Year-end fair value of unvested awards granted in the current year. Year-Over-Year Difference of Year-End Fair Values for Unvested Awards Granted in Prior Years [Member] Year-over-year difference of year-end fair values for unvested awards granted in prior years.