Annual report pursuant to Section 13 and 15(d)

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

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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 547,988 $ 531,026
Accumulated amortization (156,009) (95,020)
Net carrying amount 391,979 436,006
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 408,267 408,267
Accumulated amortization (95,167) (55,417)
Net carrying amount 313,100 352,850
Other amortizable intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 139,721 122,759
Accumulated amortization (60,842) (39,603)
Net carrying amount $ 78,879 $ 83,156