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Balance Sheet Components Materials and Supplies, Fuel Stock and Stored Natural Gas (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |
Inventory, Raw Materials and Supplies, Gross | $ 47,705 | $ 47,403
Other Inventory, Gross | 4,930 | 4,869
Energy Related Inventory, Gas Stored Underground | 8,719 | 11,609
Inventory, Net | $ 61,354 | $ 63,881

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- Definition Carrying amount as of the balance sheet date of natural gas stored underground in depleted gas reservoirs, aquifers, or salt caverns to meet seasonal and peak load demands, and also as insurance against unforeseen supply disruptions, and deemed to be a current asset because it is expected to be used within twelve months or in the normal operating cycle. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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