Subsequent Events (Details) $ in Thousands	May 03, 2021 USD ($) ft² Buildings	Apr. 01, 2021 USD ($) shares	Mar. 31, 2021 USD ($)
Subsequent Event [Line Items]
Preferred Stock, Redemption Amount			$ 193,623
Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Subsequent Event [Line Items]
Preferred Stock, Redemption Amount			201,300
Redeemable Preferred Stock Dividends			$ 1,300
Subsequent Event [Member] | Waltham lab properties [Member]
Subsequent Event [Line Items]
Payments to Acquire Real Estate	$ 100,000
Number of real estate properties | Buildings	2
Net Rentable Area (in sf) | ft²	137,000
Leased percentage	100.00%
Subsequent Event [Member] | Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Subsequent Event [Line Items]
Preferred Stock, Redemption Date		Apr. 01, 2021
Series B Preferred Stock Redeemed | shares		80,000
Preferred Stock, Redemption Amount		$ 201,300
Redeemable Preferred Stock Dividends		$ 1,300
Subsequent Event [Member] | Depositary shares of Series B Cumulative Redeemable Preferred [Member]
Subsequent Event [Line Items]
Series B Preferred Stock Redeemed | shares		8,000,000