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Goodwill and Other Intangible Assets - Estimated future amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 $ 20,291      
2019 20,041      
2020 19,957      
2021 19,957      
2022 19,957      
2023-2036 192,384      
Total expected amortization expense $ 292,587 $ 307,350 $ 313,777 $ 16,650