Balance Sheet Components Balance Sheet Components (Policies)

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [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 March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Materials and supplies	$	47,705	$	47,403
Fuel stock	4,930		4,869
Stored natural gas	8,719		11,609
Total	$	61,354	$	63,881