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Indebtedness (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of additional outstanding debt
At December 31, 2021 and 2020, our outstanding indebtedness consisted of the following:
  Principal Balance as of December 31,
Floating Rate Debt (1)
Maturity20212020
Revolving credit facility (2)
January 2023$800,000 $— 
Term loanSeptember 2022— 200,000 
Total floating rate debt $800,000 $200,000 
(1)As of December 31, 2021 and 2020, the unamortized net debt issuance costs on certain of these debts were $0 and $951, respectively.
(2)Outstanding borrowings under our revolving credit facility. In February 2022, we exercised our option to extend the maturity date of our revolving credit facility by one year to January 2024.
   December 31, 2021December 31, 2020
Senior Unsecured Notes (1)
CouponMaturityFace
Amount		Unamortized
Discount		Face
Amount		Unamortized
Discount
Senior unsecured notes6.750 %December 2021$— $— $300,000 $490 
Senior unsecured notes4.750 %May 2024250,000 184 250,000 263 
Senior unsecured notes9.750 %June 20251,000,000 — 1,000,000 — 
Senior unsecured notes4.750 %February 2028500,000 5,169 500,000 6,013 
Senior unsecured notes4.375 %March 2031500,000 — — — 
Senior unsecured notes5.625 %August 2042350,000 — 350,000 — 
Senior unsecured notes6.250 %February 2046250,000 — 250,000 — 
Total senior unsecured notes  $2,850,000 $5,353 $2,650,000 $6,766 
(1)As of December 31, 2021 and 2020, the unamortized net debt issuance costs on certain of these notes were $37,836 and $35,045, respectively.
Schedule of secured and other debt
 Principal Balance as of
December 31,		  Number of
Properties as
Collateral		Net Book Value of Collateral
as of December 31,
  
Secured and Other Debt
2021 (1)
2020 (1)
Interest
Rate		MaturityAt December 31, 202120212020
Mortgage note$11,120 $11,838 6.28 %July 20221 $23,525 $23,500 
Mortgage note10,479 10,724 4.85 %October 20221 19,211 19,675 
Mortgage note15,456 15,805 5.75 %October 20222 19,099 19,180 
Mortgage note15,204 15,646 6.64 %June 20231 24,593 23,023 
Mortgage notes (2)
— 620,000 3.53 %August 2026— — 705,096 
Mortgage note10,240 10,470 4.44 %July 20431 13,387 13,582 
Finance Leases6,636 7,811 7.70 %April 20262 18,527 18,097 
Total secured$69,135 $692,294 8 $118,342 $822,153 
(1)The principal balances are the amounts stated in the contracts. In accordance with GAAP, our carrying values and recorded interest expense may be different because of market conditions at the time we assumed certain of these debts. As of December 31, 2021 and 2020, the unamortized net premiums and debt issuance costs on certain of these mortgages were $(578) and $721, respectively.
(2)The property encumbered by these mortgages is located in Boston, Massachusetts and was contributed in the first quarter of 2017 to a joint venture, which we deconsolidated in December 2021 and in which we currently own a 20% equity interest. As of December 31, 2020, this property was consolidated into our financial statements. See Note 3 for further information regarding this joint venture.
Schedule of required principal payments on outstanding debt
Required principal payments on our outstanding debt as of December 31, 2021, are as follows:
YearPrincipal Payment
2022$39,067 
2023816,413 
2024251,834 
20251,002,001 
2026904 
Thereafter1,608,916 
(1)
 
(1) The carrying value of our total debt outstanding as of December 31, 2021, including unamortized debt issuance costs, premiums and discounts was $3,676,524.