DEBT (Details) (USD $)	3 Months Ended				3 Months Ended	0 Months Ended							3 Months Ended	12 Months Ended		0 Months Ended	3 Months Ended		3 Months Ended	0 Months Ended	3 Months Ended							3 Months Ended								0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	May 01, 2014 Subsequent Event [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Jan. 23, 2014 Senior Unsecured Notes due 2021 [Member]	May 23, 2013 Senior Unsecured Notes Due 2023 [Member]	May 23, 2013 Senior Unsecured Notes Due 2023 [Member] Prior to June 2018 [Member]	May 23, 2013 Senior Unsecured Notes Due 2023 [Member] Prior to June 2016 [Member]	Feb. 11, 2014 Senior Notes due 2018 [Member]	Jan. 08, 2014 Senior Notes due 2018 [Member]	Jun. 24, 2013 Senior Notes due 2018 [Member]	Mar. 31, 2014 Senior Notes due 2018 [Member]	Dec. 31, 2013 Senior Notes due 2018 [Member]	Oct. 27, 2010 Senior Notes due 2018 [Member]	Jun. 24, 2013 Senior Notes due 2018 [Member] Prior to November 2013 [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member]	Jul. 29, 2013 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Minimum [Member]	Jul. 29, 2013 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Maximum [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Federal Funds Rate [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Base Rate [Member] Minimum [Member]	Mar. 31, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Base Rate [Member] Maximum [Member]	Jul. 26, 2012 Additional Senior Notes [Member]	Mar. 31, 2014 Mortgage Indebtedness [Member]		Jan. 21, 2014 Mortgage Indebtedness [Member]	Dec. 31, 2013 Mortgage Indebtedness [Member]		May 05, 2014 Mortgage Indebtedness [Member] Subsequent Event [Member]	Mar. 31, 2014 Mortgage Indebtedness [Member] Fixed Rate Mortgages [Member]	Mar. 31, 2014 Mortgage Indebtedness [Member] Variable Rate Mortgages [Member]	Jan. 23, 2014 Debt Instrument, Redemption, Period One [Member] Senior Unsecured Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal Outstaning, Fixed Rate																												$ 100,335,000			$ 54,688,000
Principal Outstaning, Variable Rate																												29,771,000	[1]		86,640,000	[1]
Total Principal Outstanding																												130,106,000			141,328,000
Debt Instrument, Description of Variable Rate Basis																					federal funds rate	one-month LIBOR						90-day LIBOR
Debt Instrument, Basis Spread on Variable Rate																					0.50%	1.00%						4.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum																												1.00%
Debt Instrument, Interest Rate, Stated Percentage						5.50%	5.375%								8.125%															4.25%			4.10%
Expected Write-Offs in First Quarter of Next Fiscal Year Associated With Unamortized Deferred Financing Costs																												500,000
Debt Instrument, Face Amount						350,000,000	200,000,000								225,000,000												100,000,000			44,800,000			11,600,000
Debt Instrument, Redemption Price, Principal Amount Redeemed												113,800,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed									35.00%			35.00%																								35.00%
Debt Instrument, Redemption Price, Percentage, Using Proceeds of Specific Kinds of Equity Offerings																																				105.50%
Proceeds from Issuance of Debt						350,000,000	200,000,000
Proceeds from Debt, Net of Issuance Costs						340,800,000	194,600,000
Debt Instrument, Redeemable, Redemption Price of Principal Amount, Percentage									105.375%							108.125%
Line of Credit Facility, Maximum Borrowing Capacity																		375,000,000
Line of Credit Facility, Accordion Feature, Additional Borrowing Capacity																		225,000,000
Line of Credit Facility, Optional Extension Period																	1 year
Secured revolving credit facility	162,000,000		135,500,000		162,000,000
Line of Credit Facility, Current Borrowing Capacity																	125,500,000
Line of Credit Facility, Interest Rate During Period																							2.50%	3.50%	1.50%	2.50%
Line of Credit Facility, Interest Rate at Period End																	3.15%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																			0.35%	0.50%
Interest Expense	11,134,000	10,002,000			1,200,000
Line of Credit Facility, Commitment Fee Amount					300,000
Amortization of deferred financing costs	945,000	766,000
Interest Payable	7,700,000		4,700,000
Gain (Loss) on extinguishment of debt	(22,134,000)	0											21,600,000	(9,800,000)
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost													(20,800,000)	9,300,000
Write off of Deferred Debt Issuance Cost													800,000	500,000
Debt, Weighted Average Interest Rate				5.00%																								3.97%						3.66%	5.00%
Long-term Debt	842,106,000										211,300,000																	130,106,000	[2]
Extinguishment of Debt, Amount										$ 400,000	$ 210,900,000
Debt Instrument, Redemption Price, Percentage								100.00%		109.485%	109.837%																									100.00%

[1] (1) Contractual interest rates under variable rate mortgages are equal to the 90-day LIBOR plus 4.0% (subject to a 1.0% LIBOR floor).

[2] (1) Subject to a one-year extension option.