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Consolidated Statements of Cash Flows Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental Cash Flow Information [Abstract] |  |  |
Interest | $ 33,952 | $ 57,269 | $ 67,974
Income taxes | 373,900 | 276,789 | 133,283
Supplemental schedule of non-cash investing and financing activities: |  |  |
Additions to property, plant and equipment | 30,643 | 0 | 0
Fair value of net assets acquired in acquisition | 369,956 | 0 | 1,564,970
Noncontrolling interest of assets acquired | 0 | 0 | (24,160)
Liabilities assumed in acquisition | (119,157) | 0 | (17,147)
Shares issued for acquisitions | 0 | 0 | (153,096)
Noncash investing and financing activities, total | $ 250,799 | $ 0 | $ 1,370,567

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