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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease right-of-use assets, net | $ 79,456 | $ 0
Other current liabilities | (15,453) |
Operating lease liabilities | (68,387) | 0
Other current assets | 130,584 | 118,085
Other Liabilities, Noncurrent | $ (139,786) | (127,739)
Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease right-of-use assets, net |  | 74,600
Other current liabilities |  | (14,500)
Operating lease liabilities |  | (61,500)
Other current assets |  | (1,500)
Other Liabilities, Noncurrent |  | $ 2,900

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