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Commitments, Contingencies and Other Items (Capital Leases) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2017 $ 3,017
2018 2,539
2019 2,661
2020 2,661
2021 2,661
After 2021 17,297
Future minimum lease payments under existing capital leases $ 30,836