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RECENT ACCOUNTING PRONOUNCEMENTS Revenue Recognition - Effect on Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	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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- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

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