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Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Gross Amortizable Asset - Customer Relationships $ 109,752 $ 109,752
Less: Accumulated Amortization - Customer Relationships 9,829 6,552
Total Other Intangible Assets, net $ 99,923 $ 103,200