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Operating Leases - Lease Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Six months ending December 31, 2019 $ 54,035  
2020 90,674  
2021 70,059  
2022 46,132  
2023 26,139  
Thereafter 22,296  
Total 309,335  
Less amount of lease payments representing interest (40,474)  
Total present value of lease payments $ 268,861 $ 295,063