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Long-term investments -Combined Information for APUC's interest in VIE's (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Carrying amount $ 174,685 $ 59,091
Development loans receivable (e) 21,804 35,000
Performance guarantees and other commitments on behalf of VIEs 965,291 1,364,871
APUC's maximum exposure in regard to VIE's $ 1,161,780 $ 1,458,962