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Balance Sheet Components Other Property and Investments-Net and Non-current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Operating Lease, Right-of-Use Asset $ 70,834 $ 0
Finance Lease, Right-of-Use Asset 53,711 0
Non-utility property 29,557 31,355
Equity investments 32,967 29,257
Investment in affiliated trust 11,547 11,547
Notes receivable 11,161 11,073
Deferred compensation assets 8,675 8,400
Other 22,751 23,065
Investments and Other Noncurrent Assets $ 241,203 $ 114,697