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Recently Issued Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reduction of accrued liabilities   $ 777 $ (1,458) $ 1,810
ASU 2016-02 | Forecast        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
ROU asset $ 7,800      
Operating lease liability 8,300      
Reduction of accrued liabilities $ 500