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Real Estate Investments - Base Rents (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
lease
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Depreciation      
Depreciation expense $ 39,094 $ 37,416 $ 37,492
Number of master leases with agreed upon cash rent | lease 2    
Future minimum base rents receivable      
2020 $ 135,173    
2021 126,914    
2022 128,196    
2023 129,846    
2024 126,320    
Thereafter $ 625,158