DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) instrument	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) instrument	Sep. 30, 2015 USD ($)
Derivative [Line Items]
Unrealized gains on derivative instruments	$ 1,052,000	$ 11,168,000	$ 1,052,000	$ 7,311,000
Interest Rate Swap Entered Into In Anticipation of Debt Due January 2018
Derivative [Line Items]
Number of instruments entered into | instrument	4		4
Notional amount	$ 200,000,000		$ 200,000,000
Interest Rate Swap Entered Into In Anticipation of Debt Due November 2018
Derivative [Line Items]
Number of instruments entered into | instrument	6		6
Notional amount	$ 300,000,000		$ 300,000,000
Interest rate contracts
Derivative [Line Items]
Cash flow hedge loss to be reclassified within twelve months			12,200,000
6.050% Notes Due January 2018 | Notes Payable
Derivative [Line Items]
Face amount	$ 300,000,000.0		$ 300,000,000.0
Interest rate percentage	6.05%		6.05%
2.650% Notes Due November 2018 | Notes Payable
Derivative [Line Items]
Face amount	$ 400,000,000.0		$ 400,000,000.0
Interest rate percentage	2.65%		2.65%