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Recent Accounting Developments (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Lease liability $ 192,077  
Right of use asset $ 160,900  
ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Lease liability   $ 199,400
Right of use asset   170,600
ASU 2017-08    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect adjustment from the adoption of new accounting pronouncement   (1,531)
Retained earnings | ASU 2017-08    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect adjustment from the adoption of new accounting pronouncement   $ (1,531)