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Long-term investments -Combined Information for APUC's interest in VIE's (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
San Antonio Water System | APUC |  |
Variable Interest Entity [Line Items] |  |
Non-controlling interest (percent) | 20.00% |
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying amount | $ 18,623 | $ 174,685
Development loans receivable | 7,818 | 21,804
Performance guarantees and other commitments on behalf of VIEs | 106,194 | 965,291
APUC's maximum exposure in regard to VIE's | $ 132,635 | $ 1,161,780

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