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Debt - Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,890,114 $ 1,709,102
Unamortized debt issuance costs (5,849) (5,841)
Principal outstanding 1,884,131 1,703,290
Long-term debt, fair value 1,949,251 1,768,508
Debt Instrument, Unamortized Discount (Premium), Net (134) 29
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Principal outstanding 284,000 107,000
Long-term debt, fair value 284,558 107,000
Unsecured Term Loans    
Debt Instrument [Line Items]    
Long-term debt, gross 975,000 975,000
Unamortized debt issuance costs (4,070) (3,889)
Principal outstanding 970,930 971,111
Long-term debt, fair value 979,222 978,448
Unsecured Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 575,000 575,000
Unamortized debt issuance costs (1,610) (1,719)
Principal outstanding 573,390 573,281
Long-term debt, fair value 627,036 628,575
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Long-term debt, gross 56,114 52,102
Unamortized debt issuance costs (169) (233)
Principal outstanding 55,811 51,898
Long-term debt, fair value 58,435 54,485
Debt Instrument, Unamortized Discount (Premium), Net $ (134) $ 29