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Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Combinations [Abstract]      
Lease related amortization $ 37,500 $ 62,900 $ 90,000
2020 22,491    
2021 16,549    
2022 10,497    
2023 4,657    
2024 1,962    
2025 and thereafter 0    
Total $ 56,156