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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Reclassifications for Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings | $ 1,944,324 | $ 1,754,907 |  |
Recoverable costs and estimated earnings not billed | 160,727 | 149,847 |  |
Inventories, net | 378,866 | 366,974 |  |
Income Tax Expense (Benefit) | 84,728 | $ 78,579 | $ 82,946 |
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ (8,000) |  |  |
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  |  | $ (2,000)
Recoverable costs and estimated earnings not billed |  |  |  | 18,000
Inventories, net |  |  |  | $ (24,000)

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