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Goodwill and Intangible Assets (Estimated Future Amortization Expense) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 45,408
2018 45,407
2019 45,407
2020 45,407
2021 45,397
Thereafter $ 382,171