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Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use assets $ 5,815  
Operating lease, liability $ 5,876  
Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use assets   $ 7,900
Operating lease, liability   $ 8,000