TREASURY STOCK - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Dec. 15, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Oct. 25, 2016
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Stock repurchase program, authorized amount					$ 150,000,000.0
Amount available for share repurchase under this latest authorization		$ 150,000,000
Stock repurchased during period (in shares)		0	0
Stock called during period (in shares)	2,900,000
Treasury stock, average cost per share (in dollars per share)		$ 41.78		$ 41.78
Treasury stock		$ 123,100,000		$ 123,100,000