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Cash Deposits and Other Assets
 6 Months Ended
Jun. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Cash Deposits and Other Assets Cash Deposits and Other Assets
Components of cash deposits and other assets were as follows at the dates indicated (in thousands):

June 30,December 31,
20202019
Amounts associated with liability insurance program:
Insurance collateral deposits$707  $1,233  
Excess loss fund521  943  
Accumulated interest income340  609  
Other amounts:
State collateral deposits39  37  
Materials and supplies540  477  
Total cash deposits and other assets$2,147  $3,299  

We have established certain deposits to support participation in our liability insurance program and remittance of state crude oil severance taxes and other state collateral deposits. Insurance collateral deposits are held by the insurance company to cover past or potential open claims based upon a percentage of the maximum assessment under our insurance policies. Insurance collateral deposits are invested at the discretion of our insurance carrier. Excess amounts in our loss fund represent premium payments in excess of claims incurred to date that we may be entitled to recover through settlement or commutation as claim periods are closed. Interest income is earned on the majority of amounts held by the insurance companies and will be paid to us upon settlement of policy years.