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Summary of Significant Accounting Policies - Leases (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 $ 289,267  
Operating lease liabilities $ 291,402  
ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets   $ 301,100
Operating lease liabilities   $ 301,100