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Goodwill and Other Intangible Assets - Estimated future amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]          
2016   $ 22,350      
2017   19,017      
2018   17,350      
2019   17,350      
2020   17,350      
2021-2036   220,360      
Total expected amortization expense $ 311,965 $ 313,777 $ 16,650 $ 0 $ 279