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Goodwill and Intangible Assets, Estimated Amortization Expense (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Estimated Amortization Expense [Abstract]  
2017 $ 9,124
2018 11,106
2019 9,990
2020 6,903
2021 4,861
Thereafter $ 4,780