COMMITMENTS AND CONTINGENCIES (Narrative) (Details) € in Millions, $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	Dec. 31, 2012 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($) Cases	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Employment Contracts [Abstract]
Maximum cash severance payments provided for in the employment agreements						$ 24.8
Extension period for health and insurance benefits after termination, high end of range (in years)					3 years	3 years
Litigation Related to Hotel Occupany and Other Taxes
Travel Transaction Taxes
Loss Contingency Number of Lawsuits | Cases						40
Reserve for the potential resolution of issues related to travel transaction taxes (in dollars)						$ 27.0	$ 52.0
French Tax Audit [Member]
Travel Transaction Taxes
Assessed taxes including interest and penalties (in dollars) | €					€ 356
HAWAII | Litigation Related to Hotel Occupany and Other Taxes
Travel Transaction Taxes
Assessed taxes including interest and penalties (in dollars)	$ 16.5			$ 18.7
Payments of tax and interest for loss contingency related to travel transaction taxes (in dollars)						0.6	$ 2.2	$ 20.6
Loss Contingency, Reversal of Liability based on rulings			$ 16.4
Loss Contingency, Refund amount based on rulings		$ 13.7
Loss Contingency, Amount expected to be refunded based on rulings						$ 4.0