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Investment in equity investees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Method Investment Summarized Financial Information Income Statement Abstract      
Income tax expense $ 147,181 $ 119,579 $ 230,830
Equity Method Investee      
Equity Method Investment Summarized Financial Information Income Statement Abstract      
Total revenues 927,510 1,074,055 931,627
Total expenses 677,385 673,632 663,069
Net income 195,189 334,606 225,759
Income tax expense 54,936 65,817 $ 42,799
Equity Method Investment Summarized Financial Information Abstract      
Total assets 7,911,752 8,652,539  
Total liabilities $ 6,425,642 $ 6,090,722