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Intangibles (Estimated future amortization expense for lease premium) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
2019 $ 21,176  
2020 21,176  
2021 21,176  
2022 21,176  
2023 21,176  
Thereafter 156,061  
Finite-lived intangible assets 261,941 $ 286,812
Lease Premium    
Finite-Lived Intangible Assets [Line Items]    
2019 9,692  
2020 7,405  
2021 5,394  
2022 914  
2023 712  
Thereafter 827  
Finite-lived intangible assets $ 24,944 $ 37,259