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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]  
Operating lease right-of-use assets $ 284,486
Operating lease, liability 375,371
ASU 2016-02  
Summary Of Significant Accounting Policies [Line Items]  
Operating lease right-of-use assets 284,500
Operating lease, liability $ 375,400