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Equity - Non-controlling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]              
Net income attributable to non-controlling interests $ 849   $ 1,115   $ 3,666 $ 1,662  
Carrying amount of investments held by non-controlling interests in VIEs 3,573       3,573   $ 3,539
Distributions to non-controlling interests 1,962 $ 1,963 $ 1,092 $ 528 3,900 $ 1,600  
Primary Beneficiary              
Variable Interest Entity [Line Items]              
Carrying value of the investments held by Quanta in variable interest entities 12,000       12,000   12,000
Carrying amount of investments held by non-controlling interests in VIEs $ 3,600       $ 3,600   $ 3,500