Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Amortization of deferred financing fees	$ 7,296	$ 7,115	$ 2,565
Other	8,793	9,931	2,327
Total interest expense	104,098	108,474	53,923
Senior unsecured notes
Debt Instrument [Line Items]
Interest expense, debt	4,792	4,792	4,686
Mortgage debt
Debt Instrument [Line Items]
Interest expense, debt	0	2,293	2,592
Convertible debt
Debt Instrument [Line Items]
Interest expense, debt	365	0	0
Unsecured revolving credit facilities | Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	10,210	4,530	11,274
Unsecured term loan facilities | Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	$ 72,642	$ 79,813	$ 30,479