REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Schedule of Real Estate Properties Acquired (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Purchase Price	$ 0	$ 103,262
Net Lease | Jacksonville, NC
Business Acquisition [Line Items]
Purchase Price		$ 7,877
Ownership interest (percent)		100.00%
Net Lease | Iberia, MO
Business Acquisition [Line Items]
Purchase Price		$ 1,328
Ownership interest (percent)		100.00%
Net Lease | Isle, MN
Business Acquisition [Line Items]
Purchase Price		$ 1,078
Ownership interest (percent)		100.00%
Net Lease | Pine Island, MN
Business Acquisition [Line Items]
Purchase Price		$ 1,142
Ownership interest (percent)		100.00%
Net Lease | Kings Mountain, NC
Business Acquisition [Line Items]
Purchase Price		$ 21,241
Ownership interest (percent)		100.00%
Net Lease | Village of Menomonee Falls, WI
Business Acquisition [Line Items]
Purchase Price		$ 17,050
Ownership interest (percent)		100.00%
Net Lease | Rockland, MA
Business Acquisition [Line Items]
Purchase Price		$ 7,316
Ownership interest (percent)		100.00%
Net Lease | Crawfordsville, IA
Business Acquisition [Line Items]
Purchase Price		$ 6,000
Ownership interest (percent)		100.00%
Net Lease | Boardman Township, OH
Business Acquisition [Line Items]
Purchase Price		$ 5,400
Ownership interest (percent)		100.00%
Net Lease | Hilliard, OH
Business Acquisition [Line Items]
Purchase Price		$ 6,384
Ownership interest (percent)		100.00%
Net Lease | Weathersfield Township, OH
Business Acquisition [Line Items]
Purchase Price		$ 5,200
Ownership interest (percent)		100.00%
Net Lease | Rotterdam, NY
Business Acquisition [Line Items]
Purchase Price		$ 12,000
Ownership interest (percent)		100.00%
Net Lease | Wheaton, MO
Business Acquisition [Line Items]
Purchase Price		$ 970
Ownership interest (percent)		100.00%
Net Lease | Paynesville, MN
Business Acquisition [Line Items]
Purchase Price		$ 1,254
Ownership interest (percent)		100.00%
Net Lease | Loveland, CO
Business Acquisition [Line Items]
Purchase Price		$ 5,600
Ownership interest (percent)		100.00%
Net Lease | Battle Lake, MN
Business Acquisition [Line Items]
Purchase Price		$ 1,098
Ownership interest (percent)		100.00%
Net Lease | Yorktown, TX
Business Acquisition [Line Items]
Purchase Price		$ 1,207
Ownership interest (percent)		100.00%
Net Lease | St. Francis, MN
Business Acquisition [Line Items]
Purchase Price		$ 1,117
Ownership interest (percent)		100.00%