Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Other intangibles, net (Customer relationships and tradename and related accumulated amortization) (Details)

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Other intangibles, net (Customer relationships and tradename and related accumulated amortization) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 400,000 $ 400,000
Accumulated amortization (113,188) (82,012)
Finite-lived intangible assets 286,812 317,988
Customer Relationships, Net [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 360,000 360,000
Accumulated amortization (76,882) (55,706)
Finite-lived intangible assets 283,118 304,294
Trade Name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 40,000 40,000
Accumulated amortization (36,306) (26,306)
Finite-lived intangible assets $ 3,694 $ 13,694