Land, Buildings and Improvements and Assets Held for Sale - Acquisition of Real Estate (Details) $ in Thousands								9 Months Ended
	Sep. 30, 2020 USD ($) property	Sep. 23, 2020 USD ($) property	Jun. 25, 2020 USD ($) property	Mar. 09, 2020 USD ($) property	Jan. 31, 2020 USD ($) property	Jan. 24, 2020 USD ($) property	Jan. 06, 2020 USD ($) property	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)
Property, Plant and Equipment
Total Capitalized Costs								$ 350,120	$ 351,582
Operating Lease
Property, Plant and Equipment
Total Capitalized Costs								$ 354,612
Operating Lease | Newark-on-Trent, United Kingdom
Property, Plant and Equipment
Number of properties (property) | property							1
Total Capitalized Costs							$ 111,546
Operating Lease | Aurora, Oregon
Property, Plant and Equipment
Number of properties (property) | property						1
Total Capitalized Costs						$ 28,755
Contingent consideration						$ 5,000
Operating Lease | Vojens, Denmark
Property, Plant and Equipment
Number of properties (property) | property					1
Total Capitalized Costs					$ 10,611
Deferred tax liability assumed in real estate acquisitions					$ 500
Operating Lease | Kitzingen, Germany
Property, Plant and Equipment
Number of properties (property) | property				1
Total Capitalized Costs				$ 53,666
Operating Lease | Knoxville, Tennessee
Property, Plant and Equipment
Number of properties (property) | property			1
Total Capitalized Costs			$ 66,045
Operating Lease | Bluffton and Plymouth, Indiana
Property, Plant and Equipment
Number of properties (property) | property		2
Total Capitalized Costs		$ 44,466
Operating Lease | Huntley, Illinois
Property, Plant and Equipment
Number of properties (property) | property	1							1
Total Capitalized Costs	$ 39,523