Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - (Intangibles Subject to Amortization) (Details)

v3.19.2
Intangible Assets - (Intangibles Subject to Amortization) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 536,719 $ 531,026
Accumulated amortization (125,892) (95,020)
Net carrying amount 410,827 436,006
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 408,267 408,267
Accumulated amortization (75,292) (55,417)
Net carrying amount 332,975 352,850
Other amortizable intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 128,452 122,759
Accumulated amortization (50,600) (39,603)
Net carrying amount $ 77,852 $ 83,156