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Intangibles - Intangibles Lease Assets (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Intangibles [Abstract]    
Gross intangible lease assets $ 722,259 $ 615,538
Accumulated depreciation and amortization (220,676) (283,845)
Intangible assets, net(1) $ 501,583 $ 331,693
Weighted average remaining amortization period in years 6 years 5 years