Cash Deposits and Other Assets (Tables)

12 Months Ended

Dec. 31, 2017

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,
	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