STOCKHOLDERS' EQUITY (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Reconciliation of basic and diluted earnings per share
Effect of exchange of an UPREIT Unit on diluted EPS (in dollars per share)	$ 0.00
Income from continuing operations	$ 67,303	$ 21,831
Less: Income from continuing operations attributable to noncontrolling interest	(9,945)	(3,309)
Income from continuing operations attributable to common stockholders	57,358	18,522
Discontinued operations		32,140
Less: Discontinued operations attributable to noncontrolling interest		(4,871)
Discontinued operations attributable to common stockholders		$ 27,269
Basic weighted average number of common shares outstanding	57,872,599	57,106,853
Diluted weighted average number of common shares outstanding	58,505,744	57,620,655
Basic earnings per share data:
Income from continuing operations (in dollars per share)	$ 0.99	$ 0.32
Discontinued operations (in dollars per share)		$ 0.48
Net income attributable to common stockholders (in dollars per share)	$ 0.99us-gaap_EarningsPerShareBasic	$ 0.80us-gaap_EarningsPerShareBasic
Diluted earnings per share data:
Income from continuing operations (in dollars per share)	$ 0.98	$ 0.32
Discontinued operations (in dollars per share)		$ 0.47
Net income attributable to common stockholders (in dollars per share)	$ 0.98us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted
Stock Options
Reconciliation of basic and diluted earnings per share
Effect of stock awards (in shares)	441,508	355,002
Diluted earnings per share data:
Shares not included in computations of diluted EPS	0	418,113
Restricted Stock and Restricted Stock Units
Reconciliation of basic and diluted earnings per share
Effect of stock awards (in shares)	191,637	158,800

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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