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Goodwill and Other Intangible Assets - Estimated future amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2017 $ 21,957      
2018 20,291      
2019 20,041      
2020 19,957      
2021 19,957      
2022-2037 205,147      
Total expected amortization expense $ 307,350 $ 313,777 $ 16,650 $ 0