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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncement, Early Adoption    
Lease liability $ 37,457  
Right of use assets $ 37,457  
Accounting Standards Update 2016-02 | Minimum    
New Accounting Pronouncement, Early Adoption    
Lease liability   $ 42,800
Accounting Standards Update 2016-02 | Maximum    
New Accounting Pronouncement, Early Adoption    
Right of use assets   $ 42,800