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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
Finite-lived intangible assets primarily represent customer relationships and consist of the following at December 31:
(in thousands)20202019
Cost$111,041 $71,853 
Accumulated Amortization(26,372)(12,856)
Carrying Value$84,669 $58,997 
Schedule of Expected Aggregate Annual Amortization Expense for Finite-Lived intangible Assets Expected aggregate annual amortization expense for finite-lived intangible assets in each of the five succeeding years assuming no new acquisitions or impairments is shown in the table below:
(in thousands)
2021$13,656 
202213,486 
202313,451 
202412,494 
2025$12,412