Real Estate (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) ft²	Mar. 31, 2022 USD ($)	Jan. 30, 2023 ft²	Jan. 05, 2023 ft²
Real Estate Properties [Line Items]
Depreciation and amortization | $	$ 208,734	$ 177,624
Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf)	4,000,000
290 Binney
Real Estate Properties [Line Items]
Net Rentable Area (in sf)				566,000
Leased percentage				100.00%
300 Binney Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf)			195,000
Depreciation and amortization | $	$ 11,000
300 Binney Street | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf)			236,000
Leased percentage			100.00%