COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rent Expense:
Net rent expense	$ 4.4	$ 4.3	$ 3.6
Capital Commitments:
Unfunded capital commitments	39.8	$ 33.1
Chief Executive Officer [Member]
Employment Agreements:
Annual base salary	1.5
Chief Executive Officer Europe [Member]
Employment Agreements:
Annual base salary	1.0
Chief Financial Officer [Member]
Employment Agreements:
Annual base salary	0.6
Executive Vice President [Member]
Employment Agreements:
Annual base salary	0.6
General Counsel [Member]
Employment Agreements:
Annual base salary	0.8
Performance Guarantee [Member] | Loans Payable [Member]
Guarantees:
Guarantees, maximum exposure	$ 61.7