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RECENT ACCOUNTING PRONOUNCEMENTS Revenue Recognition - Effect on Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net earnings | $ 33,505 | $ 38,406
Comprehensive income | $ 51,003 | 59,212
Accounting Standards Update 2014-09 | As Previously Reported |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net earnings |  | 38,149
Comprehensive income |  | 58,955
Accounting Standards Update 2014-09 | New Revenue Standard Adjustment |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net earnings |  | 257
Comprehensive income |  | $ 257

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