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Basis of Presentation Basis of Presentation (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
ASU adoption adjustment   $ 2,000
Operating lease right-of-use assets $ 268,101 0
Operating lease liabilities $ 272,515 $ 0