Real Estate Transactions (Acquisitions) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
1200 Peachtree
Tangible assets:
Building and improvements	$ 62,836
Land and improvements	19,495
Tangible assets	82,331
Intangible assets:
Total intangible assets	9,969
Intangible liabilities:
Total intangible liabilities	0
Total net assets acquired	92,300
1200 Peachtree | In-place leases
Intangible assets:
Total intangible assets	9,969
1200 Peachtree | Above market leases
Intangible assets:
Total intangible assets	0
Terminus
Tangible assets:
Building and improvements	410,826
Land and improvements	49,345
Tangible assets	460,171
Intangible assets:
Total intangible assets	31,867
Intangible liabilities:
Total intangible liabilities	4,745
Total net assets acquired	487,293
Terminus | In-place leases
Intangible assets:
Total intangible assets	24,674
Terminus | Above market leases
Intangible assets:
Total intangible assets	$ 7,193