Entity Central Index Key Pay Vs Performance Disclosure [Line Items] Slager. Slager [Member] Slager [Member] Vander Ark. Vander Ark [Member] Vander Ark [Member] SCT stock awards column value. SCT Stock Awards Column Value [Member] S C T Stock Awards Column Value [Member] Year-end fair value of outstanding equity awards granted in covered year. Year-End Fair Value of Outstanding Equity Awards Granted in Covered Year [Member] Year End Fair Value Of Outstanding Equity Awards Granted In Covered Year [Member] Change in fair value of outstanding equity awards granted in prior years. Change in Fair Value of Prior-Year Equity Awards Vested in Covered Year [Member] Change In Fair Value Of Outstanding Equity Awards Granted In Prior Years [Member] Change in fair value of prior-year equity awards vested in covered year. Change in Fair Value of Prior-Year Equity Awards Vested in Covered Year [Member] Change In Fair Value Of Prior Year Equity Awards Vested In Covered Year [Member] Fair value as of vesting date of equity awards granted and vested in covered year. Fair Value as of Vesting Date of Equity Awards Granted and Vested in Covered Year [Member] Fair Value As Of Vesting Date Of Equity Awards Granted And Vested In Covered Year [Member] Average value of dividends paid on equity awards not otherwise reflected in fair value of total compensation. Average Value of Dividends Paid on Equity Awards not Otherwise Reflected in Fair Value of Total Compensation [Member] Average Value Of Dividends Paid On Equity Awards Not Otherwise Reflected In Fair Value Of Total Compensation [Member]