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Balance Sheet Components - Other Property and Investments-Net and Other Non-current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Operating lease ROU assets $ 72,588 $ 69,746
Finance lease ROU assets 49,159 50,980
Non-utility property 26,774 27,159
Equity investments 51,748 51,258
Investment in affiliated trust 11,547 11,547
Notes receivable 16,375 14,060
Deferred compensation assets 8,435 8,948
Other 25,842 23,394
Total $ 262,468 $ 257,092