DEBT - Schedule of Line of Credit Facilities (Details) - Secured Debt - Credit Facility	9 Months Ended
	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Aggregate borrowing capacity under Credit Agreement	$ 400,000,000	$ 400,000,000
Available under Credit Agreement	$ 170,700,000	157,500,000
Borrowing capacity limit multiple of EBITDA	4.5
Term Loan
Line of Credit Facility [Line Items]
Aggregate borrowing capacity under Credit Agreement	$ 100,000,000
Term Loan Facility amounts outstanding	20,300,000	41,500,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Aggregate borrowing capacity under Credit Agreement	300,000,000
Term Loan Facility amounts outstanding	209,000,000	201,000,000
Letters of Credit
Line of Credit Facility [Line Items]
Term Loan Facility amounts outstanding	$ 0	$ 0