ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2016
Goodwill and Other Intangible Assets
Period of operation forecasts used in impairment test	5 years
Weighted average cost of capital (as a percent)	8.50%
Minimum
Goodwill and Other Intangible Assets
Assumed annual growth rate of cash flows (as a percent)	1.00%
Discount rate on estimated discounted cash flows (as a percent)	10.50%
Maximum
Goodwill and Other Intangible Assets
Assumed annual growth rate of cash flows (as a percent)	3.00%
Discount rate on estimated discounted cash flows (as a percent)	13.50%