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Schedule of Estimated Future Amortization Expense Related to Intangible Asset (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Estimated amortization expense, 2018 $ 17,562
Estimated amortization expense, 2019 17,562
Estimated amortization expense, 2020 15,923
Estimated amortization expense, 2021 7,023
Estimated amortization expense, 2022 6,624
Estimated amortization expense, Thereafter $ 45,143