DEBT - Summary outstanding indebtedness (Details)						12 Months Ended
	Dec. 19, 2014	May. 06, 2014	Mar. 14, 2014	Jan. 10, 2014	Jan. 09, 2014	Dec. 31, 2015 USD ($) item property	Dec. 31, 2014 USD ($)	Jan. 02, 2014	Oct. 10, 2013 USD ($)	Jul. 22, 2013 property	Mar. 08, 2013 property	Mar. 07, 2013 property	Jan. 25, 2013 property
Debt
Number of Properties Encumbered | item						38
Outstanding Principal Balance						$ 677,096,000	$ 626,533,000
Senior Unsecured Credit Facility dated October 10, 2013
Debt
Maximum borrowing capacity						300,000,000
Unsecured debt | Senior Unsecured Credit Facility dated October 10, 2013
Debt
Maximum borrowing capacity						300,000,000			$ 300,000,000
Outstanding Principal Balance						$ 170,000,000	200,000,000
Unsecured debt | KeyBank National Association Term Loan due April 7, 2022
Debt
Interest Rate (as a percent)						2.38%
Outstanding Principal Balance						$ 140,000,000
Unsecured debt | Revolving credit facility | Senior Unsecured Credit Facility dated October 10, 2013
Debt
Maximum borrowing capacity						$ 225,000,000			225,000,000
Interest Rate (as a percent)						2.33%
Outstanding Principal Balance						$ 95,000,000	125,000,000
Unsecured debt | Term loan | Senior Unsecured Credit Facility dated October 10, 2013
Debt
Maximum borrowing capacity						$ 75,000,000			$ 75,000,000
Interest Rate (as a percent)						3.94%		3.94%
Outstanding Principal Balance						$ 75,000,000	75,000,000
Mortgage loans
Debt
Number of Properties Encumbered | property						38
Outstanding Principal Balance						$ 367,096,000	$ 426,533,000
Mortgage loans | Voya (formerly known as ING Life Insurance and Annuity) 6.10% Fixed due March 1, 2019
Debt
Interest Rate (as a percent)							6.10%
Amortization Period							20 years
Outstanding Principal Balance							$ 62,327,000
Mortgage loans | Voya (formerly known as ING Life Insurance and Annuity) 4.55% Fixed due March 1, 2019
Debt
Interest Rate (as a percent)							4.55%
Amortization Period							25 years
Outstanding Principal Balance							$ 32,995,000
Mortgage loans | Voya (formerly known as ING Life Insurance and Annuity) 5.18% Fixed due March 1, 2019 One
Debt
Interest Rate (as a percent)						5.18%
Amortization Period						20 years
Number of Properties Encumbered | property						2
Outstanding Principal Balance						$ 42,574,000
Mortgage loans | Voya (formerly known as ING Life Insurance and Annuity) 5.18% Fixed due March 1, 2019 Two
Debt
Interest Rate (as a percent)						5.18%
Amortization Period						20 years
Number of Properties Encumbered | property						4
Outstanding Principal Balance						$ 38,159,000
Mortgage loans | Voya (formerly known as ING Life Insurance and Annuity) 5.18% Fixed due March 1, 2019 Three
Debt
Interest Rate (as a percent)						5.18%
Amortization Period						20 years
Number of Properties Encumbered | property						3
Outstanding Principal Balance						$ 24,610,000
Mortgage loans | Voya (formerly known as ING Life Insurance and Annuity) 5.18% Fixed due March 1, 2019 Four
Debt
Interest Rate (as a percent)						5.18%
Amortization Period						20 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 17,482,000
Mortgage loans | KeyBank National Association 4.46% Fixed due February 1, 2023
Debt
Interest Rate (as a percent)						4.46%
Amortization Period						30 years
Number of Properties Encumbered | property						4							4
Outstanding Principal Balance						$ 27,991,000	28,489,000
Mortgage loans | KeyBank National Association 4.52% Fixed due April 1, 2023
Debt
Interest Rate (as a percent)						4.52%
Amortization Period						30 years
Number of Properties Encumbered | property						3						3
Outstanding Principal Balance						$ 21,683,000	22,061,000
Mortgage loans | KeyBank National Association 4.30% Fixed due April 1, 2023
Debt
Interest Rate (as a percent)						4.30%
Amortization Period						30 years
Number of Properties Encumbered | property						3					3
Outstanding Principal Balance						$ 21,022,000	21,403,000
Mortgage loans | KeyBank National Association 4.95% Fixed due August 1, 2023
Debt
Interest Rate (as a percent)						4.95%
Amortization Period						30 years
Number of Properties Encumbered | property						2				2
Outstanding Principal Balance						$ 37,352,000	37,939,000
Mortgage loans | Bank of America Commercial Mortgage 6.41% Fixed due September 1, 2017
Debt
Interest Rate (as a percent)						6.41%
Amortization Period						25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 7,916,000	8,157,000
Mortgage loans | Merrill Lynch Mortgage Lending Inc. 6.38% Fixed due August 1, 2016
Debt
Interest Rate (as a percent)						6.38%
Amortization Period						30 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 5,047,000	5,151,000
Mortgage loans | GE Capital Financial Inc. 5.39% Fixed due April 1, 2020 one
Debt
Interest Rate (as a percent)						5.39%
Amortization Period						25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 9,110,000	9,300,000
Mortgage loans | GE Capital Financial Inc. 5.39% Fixed due April 1, 2020 two
Debt
Interest Rate (as a percent)						5.39%
Amortization Period						25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 4,905,000	5,007,000
Mortgage loans | MetaBank 4.25% Fixed due August 1, 2018
Debt
Interest Rate (as a percent)						4.25%
Amortization Period						20 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 6,852,000	7,104,000
Mortgage loans | Bank Of Cascades Variable due December 19, 2024, Note A
Debt
Interest Rate (as a percent)						2.43%
Amortization Period	25 years					25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 9,556,000	9,800,000
Mortgage loans | Bank Of Cascades 4.30% Fixed due December 19, 2024, Note B
Debt
Interest Rate (as a percent)						4.30%
Amortization Period	25 years					25 years
Outstanding Principal Balance						$ 9,556,000	9,800,000
Mortgage loans | Goldman Sachs 5.67% Fixed due July 6, 2016
Debt
Interest Rate (as a percent)						5.67%
Amortization Period						25 years
Number of Properties Encumbered | property						2
Outstanding Principal Balance						$ 13,467,000	$ 13,787,000
Mortgage loans | Compass Bank 4.57% Fixed due May 17, 2018
Debt
Interest Rate (as a percent)							4.57%
Amortization Period							20 years
Outstanding Principal Balance							$ 12,505,000
Mortgage loans | Compass Bank Variable due May 6, 2020
Debt
Interest Rate (as a percent)						2.83%
Amortization Period		25 years				25 years
Number of Properties Encumbered | property						3
Outstanding Principal Balance						$ 24,015,000	24,637,000
Mortgage loans | General Electric Capital Corporation 5.39% Fixed due April 1, 2020, one
Debt
Interest Rate (as a percent)						5.39%
Amortization Period						25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 5,160,000	5,266,000
Mortgage loans | General Electric Capital Corporation 5.39% Fixed due April 1, 2020, two
Debt
Interest Rate (as a percent)						5.39%
Amortization Period						25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 6,041,000	6,167,000
Mortgage loans | General Electric Capital Corporation Variable due April 1, 2018
Debt
Interest Rate (as a percent)						4.11%
Amortization Period						20 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 5,852,000	$ 7,213,000
Mortgage loans | General Electric Capital Corporation 5.03% Fixed due March 1, 2019
Debt
Interest Rate (as a percent)							5.03%
Amortization Period							25 years
Outstanding Principal Balance							$ 9,775,000
Mortgage loans | AIG 6.11% Fixed due January 1, 2016
Debt
Interest Rate (as a percent)							6.11%
Amortization Period							20 years
Outstanding Principal Balance							$ 12,938,000
Mortgage loans | Greenwich Capital Financial Products, Inc. 6.20% Fixed due January 6, 2016
Debt
Interest Rate (as a percent)							6.20%
Amortization Period							30 years
Outstanding Principal Balance							$ 22,711,000
Mortgage loans | Wells Fargo Bank National Association 5.53% Fixed due October 1, 2015
Debt
Interest Rate (as a percent)							5.53%
Amortization Period							25 years
Outstanding Principal Balance							$ 3,523,000
Mortgage loans | Wells Fargo Bank National Association 5.57% due January 1, 2016
Debt
Interest Rate (as a percent)							5.57%
Amortization Period							25 years
Outstanding Principal Balance							$ 6,038,000
Mortgage loans | U.S. Bank, NA 6.22% Fixed due November 1, 2016
Debt
Interest Rate (as a percent)						6.22%
Amortization Period					30 years	30 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 17,179,000	17,536,000
Mortgage loans | U.S. Bank, NA 6.13% Fixed due November 11, 2021
Debt
Interest Rate (as a percent)						6.13%
Amortization Period				25 years		25 years
Number of Properties Encumbered | property						1
Outstanding Principal Balance						$ 11,567,000	$ 11,819,000
Mortgage loans | U.S. Bank, NA 5.98% Fixed due March 8, 2016
Debt
Interest Rate (as a percent)							5.98%
Amortization Period			30 years				30 years
Outstanding Principal Balance							$ 13,085,000