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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 11, 2019 | Jan. 01, 2019
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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 |

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