GOODWILL AND OTHER INTANGIBLE ASSETS (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 469,433,000		$ 469,433,000
Number of operating segments | segment	3
Goodwill impairment			$ 0
Amortization expense	$ 2,104,000	$ 2,391,000