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Intangibles (Customer relationships and related accumulated amortization) (Details) - Customer Relationships - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 360,000 $ 360,000
Accumulated amortization (108,647) (98,059)
Finite-lived intangible assets $ 251,353 $ 261,941