DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Gross notional amounts (Details) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Interest Rate Swap
Derivative instruments and hedging activities
Estimated additional amount to be reclassified as an increase to interest expense	$ 2.4
Interest Rate Swap \| Cash Flow Hedging
Derivative instruments and hedging activities
Gross notional amounts of cash flow hedges	210.4
Interest Rate Cap \| Cash Flow Hedging
Derivative instruments and hedging activities
Gross notional amounts of cash flow hedges	$ 100.0

Nominal or face amount used to calculate payments on the derivative liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant