Cash Deposits and Other Assets (Tables)

6 Months Ended

Jun. 30, 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):

	June 30,		December 31,
	2017		2016
Insurance collateral deposits	$	4,824	$	5,032
State collateral deposits	62		143
Materials and supplies	344		354
Total	$	5,230	$	5,529