SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 631,572	$ 656,083
Intangible assets	$ 663,572	688,083
Software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	3 years
Distribution Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 402,975	428,499
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	85,340	92,049
Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	107,343	121,253
Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 35,914	14,282
Minimum | Distribution Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	14 years
Minimum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	13 years
Minimum | Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	7 years
Maximum | Distribution Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	22 years
Maximum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	17 years
Maximum | Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	14 years
Insurance Licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 32,000	$ 32,000