SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2011

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of assets and liabilities measured at fair value on a recurring basis

				Fair Value Measurements at Reporting Date Using
Description	December 31, 2011			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other liabilities—Cash Flow Hedge Swap Agreements	$	(8,311	)	$	—	$	(8,311	)	$	—

Schedule of fair value of financial instruments

	December 31, 2011				December 31, 2010
	Fair Value		Carrying Value		Fair Value		Carrying Value
Note receivable from Preferred Operating Partnership unit holder	$	104,049	$	100,000	$	115,696	$	100,000
Fixed rate notes payable and notes payable to trusts	$	1,008,039	$	938,681	$	777,575	$	731,588
Exchangeable senior notes	$	92,265	$	87,663	$	118,975	$	87,663

Schedule of computation of net income per common share

	For the Year Ended December 31,
	2011			2010			2009
Net income attributable to common stockholders	$	50,449		$	26,331		$	31,977
Add: Income allocated to noncontrolling interest—Preferred Operating Partnership and Operating Partnership		7,978			7,096			8,012
Subtract: Fixed component of income allocated to noncontrolling interest—Preferred Operating Partnership		(5,750	)		(5,750	)		(5,750	)
Net income for diluted computations	$	52,677		$	27,677		$	34,239
Weighted average common shares outstanding:
Average number of common shares outstanding—basic		92,097,008			87,324,104			86,343,029
Operating Partnership units		3,049,935			3,356,963			3,627,368
Preferred Operating Partnership units		989,980			989,980			989,980
Dilutive and cancelled stock options		546,585			379,406			122,457
Average number of common shares outstanding—diluted		96,683,508			92,050,453			91,082,834
Net income per common share
Basic	$	0.55		$	0.30		$	0.37
Diluted	$	0.54		$	0.30		$	0.37