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Goodwill and Other Intangibles (Estimated Amortization of Intangibles) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 amortization expense $ (1,622)
2019 amortization expense (1,405)
2020 amortization expense (1,228)
2021 amortization expense (1,001)
2022 amortization expense (883)
Total amortization expense (6,139)
2018 amortization benefit 923
2019 amortization benefit 713
2020 amortization benefit 541
2021 amortization benefit 389
2022 amortization benefit 51
Total amortization benefit 2,617
2018 amortization, net (699)
2019 amortization, net (692)
2020 amortization, net (687)
2021 amortization, net (612)
2022 amortization, net (832)
Total amortization, net $ (3,522)