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Intangible assets - Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2016 Remaining $ 12,463  
2017 45,091  
2018 39,372  
2019 35,428  
2020 32,718  
2021 30,139  
thereafter 198,759  
Net $ 393,970 $ 2,895