REAL ESTATE - Properties Represented More than 10% of Company’s Total Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) ft² $ / ft²
Real Estate Properties [Line Items]
Rentable Square Feet | ft²	7,800,000
Total Real Estate, Net	$ 2,037,867
Percentage of Total Assets	40.60%
Annualized Base Rent	$ 94,932
Occupancy	88.00%
Accenture Tower | Assets, Total
Real Estate Properties [Line Items]
Rentable Square Feet | ft²	1,457,724
Total Real Estate, Net	$ 361,536
Percentage of Total Assets	13.70%
Annualized Base Rent	$ 32,529
Average Annualized Base Rent per sq. ft. | $ / ft²	27.74
Occupancy	80.50%