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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2017-07 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cost of sales | $ 1,818,398 | $ 1,812,961 | $ 1,603,070
Selling, research & development and administrative | 454,617 | 429,955 | 387,424
Total Operating Expenses | 2,488,039 | 2,478,492 | 2,145,796
Operating Income | 371,693 | 286,269 | 323,487
Miscellaneous, net | 1,556 | 5,550 | 6,694
Total Other (Expense) Income | (29,624) | (20,249) | (28,662)
Income before Income Taxes | $ 342,069 | 266,020 | $ 294,825
Accounting Standards Update 2018-02 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of accounting standards |  | 6,658 |
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income/(Loss) |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of accounting standards |  | $ (6,658) |

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