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INCOME TAXES - Net Earnings Before Income Taxes by Geographical Area (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net earnings before income taxes by geographical area      
U.S. $ 970,892 $ 1,073,879 $ 1,203,880
Foreign (35,568) (54,821) 46,825
Earnings before income taxes $ 935,324 $ 1,019,058 $ 1,250,705