Cash Deposits and Other Assets

Components of cash deposits and other assets were as follows at the dates indicated (in thousands):



	December 31,
	2017		2016

Amounts associated with liability insurance program:
Insurance collateral deposits	$	3,767	$	2,599
Excess loss fund	2,284		1,450
Accumulated interest income	814		812
Other amounts:
State collateral deposits	57		143
Materials and supplies	273		354
Other	37		171
Total	$	7,232	$	5,529

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. 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.

Insurance collateral deposits are invested at the discretion of our insurance carrier. This fair value measure relies on inputs from quoted prices for similar assets and is thus categorized as a “Level 3” valuation in the fair value hierarchy (see Note 10 for further information).