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Real Estate Investments - Depreciation and Base Rents (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
lease
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Depreciation      
Depreciation expense $ 37,416 $ 37,492 $ 35,809
Number of master leases with agreed upon cash rent | lease 2    
Future minimum base rents receivable under the remaining non-cancelable terms of operating leases excluding the effects of straight-line rent and renewal options      
2019 $ 133,666    
2020 140,353    
2021 131,284    
2022 121,235    
2023 124,897    
Thereafter $ 760,163