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Lease Obligations - Future Minimum Annual Fixed Rentals and Rent Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Future minimum annual fixed rentals under operating leases    
2019 $ 118,379  
2020 113,256  
2021 108,988  
2022 104,641  
2023 101,524  
Thereafter 830,179  
Total 1,376,967  
Rent expense $ 110,800 $ 86,500