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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenue from External Customer [Line Items]        
Revenue recognized $ 16,181 $ 21,193 $ 54,951 $ 70,164
Bill and Hold Arrangement        
Revenue from External Customer [Line Items]        
Revenue recognized     $ 4,400