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New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Increase in noncurrent deferred income taxes | $ (118,764) | $ (117,054)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2015-17 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Decrease in current deferred income taxes |  | 145,700
Increase in noncurrent deferred income taxes |  | (113,800)
Decrease in other liabilities |  | $ 31,900

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