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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 02, 2017	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2009	Dec. 31, 2016	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible Assets Including Goodwill Acquired		$ 537,148	$ 13,330
Gross amount			23,030		$ 23,030	$ 29,166
Impairment charges			12,939
Excess purchase price over fair value of net assets acquired assigned to goodwill		$ 102,003			$ 47,148
Minimum
Finite-Lived Intangible Assets [Line Items]
Economic Useful Life		1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Economic Useful Life		15 years
Australian Acquiree
Finite-Lived Intangible Assets [Line Items]
Economic Useful Life				30 years
Impairment charges			$ 12,939
Novae
Finite-Lived Intangible Assets [Line Items]
Finite lived other intangible assets	$ 385,405
Value of business acquired	$ 257,000
Weighted average useful life	7 years
Indefinite lived intangible assets	$ 94,748
Excess purchase price over fair value of net assets acquired assigned to goodwill	54,047
Contessa Limited
Finite-Lived Intangible Assets [Line Items]
Excess purchase price over fair value of net assets acquired assigned to goodwill		$ 1,000
Distribution networks | Novae
Finite-Lived Intangible Assets [Line Items]
Finite lived other intangible assets	$ 128,463
VOBA - Novae
Finite-Lived Intangible Assets [Line Items]
Gross amount		256,942
VOBA - Novae | Novae
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross amount		$ 2,140
Other Intangible Assets | Novae
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	13 years

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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