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Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Gross Amortizable Asset - Customer Relationships $ 109,752 $ 109,752
Less: Accumulated Amortization - Customer Relationships 21,295 19,657
Total Other Intangible Assets, net $ 88,457 $ 90,095