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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Affect on other current assets as a result of adoption of new accounting guidance | $ (51,451) |  | $ (74,203)
Affect on deferred income taxes as a result of adoption of new accounting guidance | (131,149) |  | (137,638)
Affect on retained earnings as a result of adoption of new accounting guidance | $ (2,276,634) |  | (2,057,915)
Accounting Standards Update 2018-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Results of adoption of new accounting guidance |  |  | 0
Accounting Standards Update 2018-02 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Results of adoption of new accounting guidance |  |  | 6,435
Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Results of adoption of new accounting guidance |  |  | (645)
Affect on other current assets as a result of adoption of new accounting guidance |  | $ 7,300 |
Affect on deferred income taxes as a result of adoption of new accounting guidance |  | 6,700 |
Affect on retained earnings as a result of adoption of new accounting guidance |  | $ 600 |
Accounting Standards Update 2016-16 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Results of adoption of new accounting guidance |  |  | (645)
Adjustments for New Accounting Pronouncement | Accounting Standards Update 2018-02 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Results of adoption of new accounting guidance |  |  | (6,400)
Adjustments for New Accounting Pronouncement | Accounting Standards Update 2018-02 | AOCI |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Results of adoption of new accounting guidance |  |  | $ 6,400

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