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New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets $ 285,768  
Operating lease liabilities $ 285,768  
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