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Commitments and Contingencies (Lease Commitments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 2,669
2019 2,569
2020 2,474
2021 2,453
2022 2,396
Thereafter 195,721
Total $ 208,282