Equity method and other investments Equity Method and Other Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity method and other investments	$ 252,483	$ 241,983
Adjusted cost method investments
Schedule of Equity Method Investments [Line Items]
Equity method and other investments	18,105	10,448
Other equity method partnerships
Schedule of Equity Method Investments [Line Items]
Equity method and other investments	110,169	114,611
APAC JV - Nonsolidated Unrelated Noncontrolling Investor
Schedule of Equity Method Investments [Line Items]
Equity method and other investments	$ 124,209	$ 116,924