Business Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 6,229,278	$ 6,909,256
Total assets	0	1,022,696
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total assets		1,022,696
Corporate Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	1,047,506	715,230
Same Store [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	4,545,476	4,692,491
Other Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	$ 636,296	$ 478,839