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Goodwill and Other Intangible Assets Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Customer Relationships $ 128,781   $ 128,781  
Less: Impairment of Other Intangible Assets (18,650) $ 0 (18,650) $ 0
Less: Accumulated Amortization for Customer Relationships (3,655)   (3,655)  
Total Other Intangible Assets, net $ 106,476   $ 106,476