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Intangible Assets - Future Amortization (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Estimated annual amortization expense  
2017 (remaining) $ 31,488
2018 41,984
2019 41,979
2020 41,901
2021 41,814
Thereafter 538,393
Net, finite-lived intangible assets $ 737,559