Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Amortization of deferred financing fees	$ 2,046	$ 1,518	$ 7,414	$ 3,898
Other	914	2,547	4,701	6,148
Total interest expense	22,930	27,514	73,065	75,196
Convertible senior notes
Debt Instrument [Line Items]
Interest expense, debt	3,282	0	9,381	0
Senior unsecured notes
Debt Instrument [Line Items]
Interest expense, debt	645	1,198	2,917	3,594
Mortgage debt
Debt Instrument [Line Items]
Interest expense, debt	88	0	88	0
Unsecured revolving credit facilities | Unsecured term loans
Debt Instrument [Line Items]
Interest expense, debt	513	2,557	1,581	8,226
Unsecured term loan facilities | Unsecured term loans
Debt Instrument [Line Items]
Interest expense, debt	$ 15,442	$ 19,694	$ 46,983	$ 53,330