DEBT (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended	0 Months Ended		0 Months Ended						6 Months Ended	12 Months Ended		0 Months Ended	6 Months Ended		6 Months Ended	0 Months Ended	6 Months Ended							0 Months Ended	6 Months Ended					0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 Revolving Credit Facility [Member]	Jan. 23, 2014 Senior Unsecured Notes due 2021 [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]	Jun. 30, 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]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member]	Jul. 29, 2013 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member]	Jun. 30, 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]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Federal Funds Rate [Member]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Base Rate [Member] Minimum [Member]	Jun. 30, 2014 2013 Revolving Credit Facility [Member] Revolving Credit Facility [Member] Base Rate [Member] Maximum [Member]	Jul. 26, 2012 Additional Senior Notes [Member]	May 01, 2014 Mortgage Indebtedness [Member]	Jun. 30, 2014 Mortgage Indebtedness [Member]	Apr. 08, 2014 Mortgage Indebtedness [Member]	Jan. 21, 2014 Mortgage Indebtedness [Member]	Dec. 31, 2013 Mortgage Indebtedness [Member]	Jun. 30, 2014 Mortgage Indebtedness [Member] Fixed 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																																$ 125,400,000			$ 54,688,000
Principal Outstaning, Variable Rate																																0			86,640,000
Total Principal Outstanding																																125,400,000			141,328,000
Debt Instrument, Description of Variable Rate Basis																								federal funds rate	one-month LIBOR
Debt Instrument, Basis Spread on Variable Rate																								0.50%	1.00%
Debt Instrument, Interest Rate, Stated Percentage									5.50%	5.375%								8.125%															4.10%	4.25%
Debtor Reorganization Items, Write-off of Deferred Financing Costs and Debt Discounts			500,000																													100,000
Repayments of Long-term Debt																															29,800,000
Debt Instrument, Face Amount									350,000,000	200,000,000								225,000,000												100,000,000			11,600,000	44,800,000
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	0		0		135,500,000	0	0
Line of Credit Facility, Current Borrowing Capacity																				289,500,000
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																				3.66%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																						0.35%	0.50%
Interest Expense	10,994,000	10,143,000	22,128,000	20,145,000		800,000	2,000,000
Line of Credit Facility, Commitment Fee Amount						400,000	600,000
Amortization of deferred financing costs	927,000	823,000	1,872,000	1,589,000
Interest Payable	9,700,000		9,700,000		4,700,000
Gain (Loss) on extinguishment of debt	(162,000)	(9,750,000)	(22,296,000)	(9,750,000)												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%	3.96%				3.96%
Long-term Debt	675,400,000		675,400,000											211,300,000																		125,400,000
Extinguishment of Debt, Amount													$ 400,000	$ 210,900,000
Debt Instrument, Redemption Price, Percentage											100.00%		109.485%	109.837%																							100.00%