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Selected Balance Sheet Accounts (Details 2)
$ in Thousands
Jun. 30, 2017
USD ($)
Amortization expense for the remainder of the year and for the next five years  
2017 $ 2,618
2018 5,028
2019 3,655
2020 2,224
2021 2,116
2022 1,518
Thereafter 1,676
Total $ 18,835