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STORAGE FACILITIES (Details 2) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) property	Dec. 31, 2014 USD ($) property
2015 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	11
Purchase / Sales Price	$ 92,965
2015 Acquisitions | Texas Asset Seventeen
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 7,295
2015 Acquisitions | HSRE Assets Two
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	4
Purchase / Sales Price	$ 27,500
2015 Acquisitions | Texas Asset Eighteen
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 15,795
2015 Acquisitions | Florida Assets Eleven
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 7,300
2015 Acquisitions | Arizona Asset Six
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 10,100
2015 Acquisitions | Florida Assets Twelve
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 10,500
2015 Acquisitions | Arizona Asset Five
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 7,900
2015 Acquisitions | Tennessee Assets
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property	1
Purchase / Sales Price	$ 6,575
2014 Acquisitions
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		53
Purchase / Sales Price		$ 568,226
2014 Acquisitions | Connecticut Asset
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 4,950
2014 Acquisitions | Florida Asset One
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 14,000
2014 Acquisitions | Florida Assets Two
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		2
Purchase / Sales Price		$ 14,450
2014 Acquisitions | California Asset
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 8,300
2014 Acquisitions | Maryland Asset One
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 15,800
2014 Acquisitions | Maryland Asset Two
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 15,500
2014 Acquisitions | Arizona Asset One
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 14,750
2014 Acquisitions | Pennsylvania Asset
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 7,350
2014 Acquisitions | Texas Asset One
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 8,225
2014 Acquisitions | Texas Asset Two
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 6,450
2014 Acquisitions | New York Asset One
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		2
Purchase / Sales Price		$ 55,000
2014 Acquisitions | Florida Asset Three
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 11,406
2014 Acquisitions | Massachusetts Asset One
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 11,100
2014 Acquisitions | Indiana Asset
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 8,400
2014 Acquisitions | Florida Assets Four
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		3
Purchase / Sales Price		$ 35,000
2014 Acquisitions | Florida Assets Five
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		2
Purchase / Sales Price		$ 15,800
2014 Acquisitions | Massachusetts Asset Two
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 23,100
2014 Acquisitions | Texas Asset Three
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 7,700
2014 Acquisitions | Texas Asset Four
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 8,500
2014 Acquisitions | Texas Asset Five
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 7,750
2014 Acquisitions | HSRE Assets
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		22
Purchase / Sales Price		$ 195,500
2014 Acquisitions | Texas Asset Six
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 18,650
2014 Acquisitions | Florida Assets Six
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		3
Purchase / Sales Price		$ 18,200
2014 Acquisitions | New York Asset Two
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 38,000
2014 Acquisitions | Texas Asset Seven
STORAGE FACILITIES
Number of Facilities, acquisitions (in properties) | property		1
Purchase / Sales Price		$ 4,345

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