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Selected Balance Sheet Accounts (Details 2)
$ in Thousands
Dec. 31, 2017
USD ($)
Amortization expense for the remainder of the year and for the next five years  
2018 $ 6,610
2019 5,236
2020 3,805
2021 3,697
2022 3,100
Thereafter 4,465
Total $ 26,913