Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill (Intangibles Subject to Amortization) (Details)

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Intangible Assets and Goodwill (Intangibles Subject to Amortization) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 591,587  
Accumulated amortization (47,172)  
Net carrying amount 544,415 $ 4,237
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 483,267  
Accumulated amortization (26,462)  
Net carrying amount 456,805  
Other amortizable intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 108,320  
Accumulated amortization (20,710)  
Net carrying amount $ 87,610