Cover [Abstract] Document Type Amendment Flag Entity Registrant Name Entity Central Index Key Exclusion of stock awards and option awards. Exclusion of Stock Awards and Option Awards [Member] Total - inclusion of equity values. Total - Inclusion of Equity Values [Member] Year-end fair value of equity awards granted during year that remained unvested as of last day of year. Year-End Fair Value of Equity Awards Granted During Year that Remained Unvested as of Last Day of Year [Member] Change in fair value from last day of prior year to last day of year of unvested equity awards. Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards [Member] Vesting-date fair value of equity awards granted during year that vested during year. Vesting-Date Fair Value of Equity Awards Granted during Year that Vested During Year [Member] Change in fair value from last day of prior year to vesting date of unvested equity awards that vested during year. Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year [Member] Fair value at last day of prior year of equity awards forfeited during year. Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year [Member]