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Intangibles (Customer relationships and related accumulated amortization) (Details) - Customer relationships - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 360,000 $ 360,000
Accumulated amortization (140,411) (119,235)
Finite-lived intangible assets $ 219,589 $ 240,765