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Summary of Significant Accounting Policies - Fair Value Assets Measured on a Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill $ 41,041 $ 41,041
Finite-Lived Intangible Assets, Gross 35,640 27,000
Finite-Lived Intangible Assets, Net $ 15,315 $ 12,207