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6. Goodwill and Intangible Assets (Details 2)
$ in Thousands
Mar. 31, 2018
USD ($)
Estimated amortization expense related to intangible assets  
2018 (April – December) $ 4,130
2019 5,507
2020 5,420
2021 5,325
2022 5,286
Thereafter 50,132
Total $ 75,800