Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fixed interest rate related to the interest rate derivative.

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Summary of the Notional Amount and Fair Value of Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair value of derivative instruments
Total fair value derivative assets	$ 3,365		$ 3,365		$ 4,136
Total fair value derivative liabilities	(7,218)		(7,218)		(3,987)
Interest Expense.	14,448	$ 16,533	32,306	$ 32,526
Fixed Interest Rate 2.96%, Maturing October 2019 [Member]
Fair value of derivative instruments
Notional Amount	$ 20,815		$ 20,815
Fixed Interest Rate	2.96%		2.96%
Total fair value derivative liabilities	$ (519)		$ (519)		(740)
Fixed Interest Rate 2.65%, Maturing December 2027 [Member]
Fair value of derivative instruments
Notional Amount	$ 50,000		$ 50,000
Fixed Interest Rate	2.65%		2.65%
Total fair value derivative liabilities	$ (1,324)		$ (1,324)		(610)
Fixed Interest Rate 2.68%, Maturing December 2027 [Member]
Fair value of derivative instruments
Notional Amount	$ 100,000		$ 100,000
Fixed Interest Rate	2.68%		2.68%
Total fair value derivative liabilities	$ (2,907)		$ (2,907)		(1,479)
Fixed Interest Rate 2.62%, Maturing December 2027 [Member]
Fair value of derivative instruments
Notional Amount	$ 100,000		$ 100,000
Fixed Interest Rate	2.62%		2.62%
Total fair value derivative liabilities	$ (2,443)		$ (2,443)		(1,015)
Interest rate swap contracts \| Designated as Hedging Instrument [Member] \| Accounts Payable and Accrued Liabilities [Member] \| Fixed Interest Rate 1.66%, Maturing May 2020 [Member]
Fair value of derivative instruments
Notional Amount	$ 40,000		$ 40,000
Fixed Interest Rate	1.66%		1.66%
Total fair value derivative liabilities	$ (25)		$ (25)		(143)
Interest rate swap contracts \| Designated as Hedging Instrument [Member] \| Accounts Payable and Accrued Liabilities [Member] \| Fixed Interest Rate 1.14%, Maturing September 2021 [Member]
Fair value of derivative instruments
Notional Amount	$ 119,359		$ 119,359
Fixed Interest Rate	1.14%		1.14%
Total fair value derivative assets	$ 3,119		$ 3,119		3,368
Interest Rate Cap [Member] \| Designated as Hedging Instrument [Member] \| Accounts Payable and Accrued Liabilities [Member] \| Fixed Interest Rate 5.00%, Maturing August 2017 [Member]
Fair value of derivative instruments
Notional Amount	$ 100,000		$ 100,000
Fixed Interest Rate	5.00%		5.00%
Interest Rate Cap [Member] \| Not Designated as Hedging Instrument [Member] \| Accounts Payable and Accrued Liabilities [Member] \| Fixed Interest Rate 2.50%, Maturing December 2019 [Member]
Fair value of derivative instruments
Notional Amount	$ 230,000		$ 230,000
Fixed Interest Rate	2.50%		2.50%
Total fair value derivative assets	$ 246		$ 246		$ 768
Interest (income) expense	$ (200)	$ 0	$ (500)	$ 0