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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 11, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
LIFO reserve $ 10,300    
Operating lease assets 373,269    
Operating lease, liability $ 375,029    
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease assets     $ 347,000
Operating lease, liability     $ 349,000
Washington Acquisition      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease assets   $ 62,000