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Operating Leases - Lease Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Three months ending December 31, 2019 $ 27,322  
2020 94,885  
2021 74,771  
2022 51,458  
2023 31,635  
Thereafter 25,485  
Total 305,556  
Less amount of lease payments representing interest (40,971)  
Total present value of lease payments $ 264,585 $ 295,063