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Basis of Presentation and Summary of Significant Accounting Policies - Accounting Pronouncements Recently Adopted (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net Cash Provided by (Used in) Financing Activities $ 3,089,000 $ 13,852,000  
Net Cash Provided by (Used in) Operating Activities $ 8,718,000 65,718,000  
Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net Cash Provided by (Used in) Financing Activities   (25,500,000)  
Net Cash Provided by (Used in) Operating Activities   $ 25,500  
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adjustment     $ 4,900,000