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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (PARANTHETICAL) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Unrealized Gains (Losses) on Derivatives, Tax | $ 1,054 | $ 12,217 | $ (3,204) | $ 8,689
Realized (Gains) Losses on Derivatives in Net Income, Tax | (5,752) | (7,671) | (12,962) | (13,077)
Change in Pension and Postretirement Benefit Plan Liability, Tax | (966) | (1,360) | (2,714) | (4,081)
Other Comprehensive Income (Loss) on Investments in Unconsolidated Affiliates, Tax | $ (442) | $ 100 | $ (1,578) | $ 288

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