Cash Deposits and Other Assets (Tables)

12 Months Ended

Dec. 31, 2018

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Components of cash deposits and other assets

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

	December 31,
	2018		2017
Amounts associated with liability insurance program:
Insurance collateral deposits (1)	$	1,453	$	3,767
Excess loss fund	1,916		2,284
Accumulated interest income	788		814
Other amounts:
State collateral deposits	57		57
Materials and supplies	443		273
Other	—		37
Total	$	4,657	$	7,232

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(1) During 2018, we issued a letter of credit of approximately $4.2 million to the insurance companies in connection with our liability insurance program, and as a result, our cash collateral deposit was refunded to us.