DEBT (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Debt
Gross debt	$ 642,210,000us-gaap_DebtInstrumentCarryingAmount
Total Debt	641,818,000us-gaap_DebtAndCapitalLeaseObligations	608,714,000us-gaap_DebtAndCapitalLeaseObligations
Mortgages Payable
Debt
Gross debt	220,140,000	221,847,000
Premiums and discounts on assumed mortgages	1,754,000	1,961,000
Total Debt	221,894,000	223,808,000
Mortgage loan with a fixed interest of 7.66% per annum, due on December 1, 2015
Debt
Gross debt	26,395,000	26,783,000
Fixed interest rate (as a percent)	7.66%	7.66%
Period of amortization schedule	20 years	20 years
Amount of balance due on maturity	25,324,000	25,324,000
Mortgage loan with a fixed interest of 4.50% per annum, due on January 5, 2027
Debt
Gross debt	46,000,000	46,000,000
Fixed interest rate (as a percent)	4.50%	4.50%
Period of amortization schedule	10 years	10 years
Amount of balance due on maturity	42,008,000	42,008,000
Mortgage loan with a fixed interest of 5.56% per annum, due on July 1, 2015
Debt
Gross debt	12,364,000	12,442,000
Fixed interest rate (as a percent)	5.56%	5.56%
Period of amortization schedule	10 years	10 years
Amount of balance due on maturity	12,288,000	12,288,000
Mortgage loan with a fixed interest of 6.65% per annum, due on July 15, 2018
Debt
Gross debt	31,363,000	32,070,000
Fixed interest rate (as a percent)	6.65%	6.65%
Period of amortization schedule	25 years	25 years
Amount of balance due on maturity	21,136,000	21,136,000
Mortgage loan with a fixed interest of 5.06% per annum, due on September 1, 2015
Debt
Gross debt	33,508,000	33,734,000
Fixed interest rate (as a percent)	5.06%	5.06%
Amount of balance due on maturity	33,068,000	33,068,000
Mortgage loan with a fixed interest of 5.39% per annum, due on March 1, 2021
Debt
Gross debt	40,352,000	40,526,000
Fixed interest rate (as a percent)	5.39%	5.39%
Amount of balance due on maturity	35,695,000	35,695,000
Mortgage loan with a fixed interest of 5.18% per annum, due on June 5, 2021
Debt
Gross debt	30,158,000	30,292,000
Fixed interest rate (as a percent)	5.18%	5.18%
Amount of balance due on maturity	26,232,000	26,232,000
Other debt
Debt
Gross debt	422,070,000	387,070,000
Premiums and discounts on assumed mortgages	(2,146,000)	(2,164,000)
Total Debt	419,924,000	384,906,000
Junior subordinated notes
Debt
Gross debt	27,070,000	27,070,000
Face amount	27,070,000	27,070,000
Junior subordinated notes \| LIBOR
Debt
Interest rate margin (as a percent)	3.25%	3.25%
Unsecured credit facilities
Debt
Gross debt	$ 395,000,000	$ 360,000,000

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

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-Topic 210

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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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