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Intangibles (Customer relationships and tradename and related accumulated amortization) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 400,000 $ 400,000
Accumulated amortization (138,059) (113,188)
Finite-lived intangible assets 261,941 286,812
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 360,000 360,000
Accumulated amortization (98,059) (76,882)
Finite-lived intangible assets 261,941 283,118
Tradename    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 40,000 40,000
Accumulated amortization (40,000) (36,306)
Finite-lived intangible assets $ 0 $ 3,694