Balance Sheet Components Balance Sheet Components (Policies)

9 Months Ended

Sep. 30, 2018

Balance Sheet Components [Abstract]

Inventory, Policy [Policy Text Block]

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30,		December 31,
	2018		2017
Materials and supplies	$	45,169	$	41,493
Fuel stock	5,347		4,843
Stored natural gas	12,250		11,739
Total	$	62,766	$	58,075