Stock-Based Compensation Plans and Employee Benefits

Stock-based Compensation—The Company recorded stock-based compensation expense of $5.2 million and $4.7 million for the three months ended March 31, 2013 and 2012, respectively, in "General and administrative" on the Company's Consolidated Statements of Operations. As of March 31, 2013, there was $12.8 million of total unrecognized compensation cost related to all unvested restricted stock units that is expected to be recognized over a weighted average remaining vesting/service period of 0.92 years.

As of March 31, 2013, an aggregate of 4.0 million shares remain available for issuance pursuant to future awards under the Company's 2006 and 2009 Long-Term Incentive Plans.

2013 Activity—During the three months ended March 31, 2013, 2,401,141 restricted stock units vested, 1,359,948 net of statutory minimum required tax withholdings. These vested restricted stock units were primarily comprised of 1,719,304 Amended Units which vested on January 1, 2013 (see below), 185,720 service-based restricted stock units granted to employees in February 2011 that cliff vested on February 11, 2013, 164,685 of annual incentive restricted stock units granted and vested to employees in February 2013 (see below) and 313,334 service-based restricted stock units granted to employees in March 2011 that cliff vested on March 20, 2013.

During the quarter ended March 31, 2013, the Company made stock-based compensation awards to certain employees in the form of annual incentive awards and long-term incentive awards.

Effective February 1, 2013, the Company granted 164,685 shares of our Common Stock in connection with annual incentive awards. The shares are fully-vested and were issued to certain employees, net of statutory minimum required tax withholdings. The employees are restricted from selling these shares for up to two years from the date of grant.

Effective February 1, 2013, the Company also granted 198,364 service-based restricted stock units, or Units, representing the right to receive an equivalent number of shares of our Common Stock (after deducting shares for minimum required statutory withholdings) if and when the Units vest. The Units will cliff vest in one installment three years from the grant date, if the employee remains employed by the Company on the vesting date, subject to certain accelerated vesting rights. Dividends will accrue but will not be paid unless and until the Units vest and are settled.

Effective February 1, 2013, the Company also granted 97,901 target amount of performance-based Units, with vesting date on December 31, 2013, and 195,806 target amount of performance-based Units, with vesting date on December 31, 2014, based on the Company's total shareholder return, or TSR, measured over the one-year and two-year performance periods ending on the vesting dates, respectively. Vesting will range from 0% to 200% of the target amount of the awards, depending on the Company's TSR performance relative to the NAREIT All REITs Index (one-half of the target amount of the award) and the Russell 2000 Index (one-half of the target amount of the award). The Company and any companies not included in the index at the beginning and end of the performance period are excluded from calculation of the performance of such index. To the extent Units vest based on the Company's TSR performance, holders will receive an equivalent number of shares of our Common Stock (after deducting shares for minimum required statutory withholdings), if the employee remains employed by the Company on the vesting date, subject to certain accelerated vesting rights. Dividends will accrue but will not be paid unless and until the Units vest and are settled. The fair values of the performance-based Units, were determined by utilizing a Monte Carlo model to simulate a range of possible future stock prices for the Company's Common Stock. The assumptions used to estimate the fair value of these performance-based awards were 0.26% for risk-free interest rate and 50.44% for expected stock price volatility.

As of March 31, 2013, the Company had the following restricted stock awards outstanding:

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1,200,000 service-based restricted stock units granted to the Company's Chairman and Chief Executive Officer that will vest in two equal installments on June 15 of 2013 and 2014. Upon vesting of these units, the holder will receive shares of the Company's Common Stock in the amount of the vested units, net of statutory minimum required tax withholdings. These awards carry dividend equivalent rights that entitle the holder to receive dividend payments prior to vesting, if and when dividends are paid on shares of the Company's Common Stock.

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1,714,303 restricted stock units originally granted to executives and other officers of the Company on December 19, 2008 (the "Original Units") and subsequently modified in July 2011 (the "Amended Units"). The number of Amended Units is equal to 75% of the Original Units granted to an employee less, in the case of each executive level employee, the number of restricted stock units granted to the executive in March 2011. The remaining Amended Units will vest on January 1, 2014, so long as the employee remains employed by the Company on the vesting dates, subject to certain accelerated vesting rights in the event of termination of employment without cause. Upon vesting of these units, holders will receive shares of the Company's Common Stock in the amount of the vested units, net of statutory minimum required tax withholdings. These awards carry dividend equivalent rights that entitle the holders to receive dividend payments prior to vesting, if and when dividends are paid on shares of the Company's Common Stock.

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140,331 service-based restricted stock units granted to employees with original vesting terms ranging from two years to three years. Upon vesting of these units, holders will receive shares of the Company's Common Stock in the amount of the vested units, net of statutory minimum required tax withholdings. These awards carry dividend equivalent rights that entitle the holders to receive dividend payments prior to vesting, if and when dividends are paid on shares of the Company's Common Stock.

Directors' Awards—During the three months ended March 31, 2013, the Company issued 51,091 shares to a former director in settlement of previously vested CSE awards. As of March 31, 2013, there were 333,660 CSEs and restricted shares granted to members of the Company's Board of Directors that remained outstanding with an aggregate intrinsic value of $3.6 million.

401(k) Plan—The Company made gross contributions of approximately $0.5 million and $0.6 million for the three months ended March 31, 2013 and 2012, respectively.