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INCOME TAXES - Changes in Liability for Tax Uncertainties, Excluding Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in liability for tax uncertainties, excluding interest
Balance at beginning of year	$ 58,681	$ 60,576	$ 45,126
Additions for tax positions related to the current year	3,930	14,119	14,916
Additions for tax positions of prior years	4,786	13,215	2,653
Reductions for tax positions of prior years	(12,417)	(14,774)	(1,616)
Reductions due to statute lapse	(5,098)	(1,527)	(402)
Settlements, audit payments, refunds - net	(5,215)	(12,928)	(101)
Balance at end of year	$ 44,667	$ 58,681	$ 60,576

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- Definition

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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