v3.8.0.1
Goodwill and Intangible Assets - Future Amortization (Details) - Customer Relationships
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 23,977
2019 23,977
2020 23,977
2021 23,977
2022 23,977
2023 and thereafter $ 394,355