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Leases (Minimum Commitment Under Operating Leases) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 84,712
2020 87,396
2021 86,212
2022 81,976
2023 80,707
Thereafter 539,047
Total undiscounted future cash flows $ 960,050