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Debt - Components of Debt (Details) - USD ($)	Jun. 30, 2021	Feb. 28, 2021	Jan. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 2,274,916,000			$ 2,280,471,000
Unsecured debt \| Revolving credit facilities
Debt Instrument [Line Items]
Debt	0			40,000,000
Unsecured debt \| Revolving credit facilities \| Senior unsecured credit facility
Debt Instrument [Line Items]
Debt	0			40,000,000
Unsecured debt \| Revolving credit facilities \| PHL unsecured credit facility
Debt Instrument [Line Items]
Debt	0			0
Unsecured debt \| Unsecured term loans
Debt Instrument [Line Items]
Debt	1,487,000,000			1,775,000,000
Deferred financing costs, net	(6,822,000)			(8,455,000)
Total debt	1,480,178,000			1,766,545,000
Borrowings, fixed interest rate	$ 1,400,000,000			$ 1,400,000,000
Weighted-average fixed interest rate	4.12%			4.19%
Amount of debt bearing variable interest	$ 57,000,000.0			$ 345,000,000.0
Weighted-average floating interest rate	2.67%			2.46%
Unsecured debt \| Unsecured term loans \| First Term Loan
Debt Instrument [Line Items]
Debt	$ 300,000,000			$ 300,000,000
Unsecured debt \| Unsecured term loans \| Second Term Loan
Debt Instrument [Line Items]
Debt	32,126,000			65,000,000
Unsecured debt \| Unsecured term loans \| Fourth Term Loan
Debt Instrument [Line Items]
Debt	110,000,000			110,000,000
Unsecured debt \| Unsecured term loans \| Sixth Term Loan
Debt Instrument [Line Items]
Debt	1,044,874,000			1,300,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2021
Debt Instrument [Line Items]
Debt	4,798,000			40,966,000
Unsecured debt \| Unsecured term loans \| Tranche 2021 Extended
Debt Instrument [Line Items]
Debt	100,148,000			173,034,000
Unsecured debt \| Unsecured term loans \| Tranche 2022
Debt Instrument [Line Items]
Debt	139,928,000			286,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2023
Debt Instrument [Line Items]
Debt	400,000,000			400,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2024
Debt Instrument [Line Items]
Debt	$ 400,000,000			$ 400,000,000
Convertible debt
Debt Instrument [Line Items]
Interest Rate	1.75%			1.75%
Debt	$ 750,000,000			$ 500,000,000
Debt premium (discount), net	12,775,000			(113,099,000)
Deferred financing costs, net	(17,835,000)			(12,568,000)
Total debt	744,940,000			374,333,000
Senior unsecured notes
Debt Instrument [Line Items]
Debt	50,000,000			100,000,000
Deferred financing costs, net	(202,000)			(407,000)
Total debt	$ 49,798,000			99,593,000
Senior unsecured notes \| Series A Notes
Debt Instrument [Line Items]
Interest Rate	5.15%	5.15%	4.70%
Debt	$ 47,600,000			60,000,000
Senior unsecured notes \| Series B Notes
Debt Instrument [Line Items]
Interest Rate	5.38%	5.38%	4.93%
Debt	$ 2,400,000			$ 40,000,000