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Share-Based Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Share-Based Compensation and Employee Benefit Plans. |
Summary of restricted share transactions under the entity's share-based compensation plans |
|  | Shares |  | Weighted Average Grant Date Fair Value |
--- | --- | --- | --- | --- | ---
Unvested at December 31, 2008 |  |  | 562,428 |  | $ | 35.69 |
Granted |  |  | 340,660 |  |  | 25.30 |
Forfeited |  |  | (5,081 | ) |  | 29.83 |
Vested |  |  | (229,017 | ) |  | 35.74 |
Unvested at December 31, 2009 |  |  | 668,990 |  |  | 30.43 |
Granted |  |  | 290,956 |  |  | 37.74 |
Forfeited |  |  | (13,986 | ) |  | 34.38 |
Vested |  |  | (276,102 | ) |  | 32.24 |
Unvested at December 31, 2010 |  |  | 669,858 |  |  | 32.77 |
Granted |  |  | 320,284 |  |  | 33.68 |
Forfeited |  |  | (18,058 | ) |  | 34.23 |
Vested |  |  | (323,706 | ) | $ | 32.86 |
Unvested at December 31, 2011 |  |  | 648,378 |  | $ | 33.13 |
Restricted shares expected to vest |  |  | 631,169 |  | $ | 33.13
Schedule of payouts for defined performance under performance-based awards of share-based compensation |
Percentile Rank |  | Earned PSUs Payout %
--- | --- | ---
75th or greater |  | 200% of PSUs granted
50th or greater |  | 100% of PSUs granted
25th |  | 50% of PSUs granted
Below 25th |  | 0% of PSUs granted
Schedule of assumptions used in Monte Carlo models for PSUs |
|  | For the Years Ended December 31, |
--- | --- | --- | ---
|  | 2011 |  | 2010 |
Grant date fair value |  | $ | 49.15 |  | $ | 53.31 |
Baseline common share value |  | $ | 35.17 |  | $ | 37.84 |
Expected volatility of common shares |  |  | 61.1 | % |  | 62.2 | %
Risk-free interest rate |  |  | 1.32 | % |  | 1.38 | %
Summary of stock option transactions under the entity's share-based compensation plans |
|  | Shares |  | Range of Exercise Price per Share |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term (in Years) |  | Aggregate Intrinsic Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at December 31, 2008 |  |  | 1,949,319 |  | $7.38 - $57.00 |  | $ | 25.96 |  |  | 5 |  | $ | 18,744 |
Granted—2009 |  |  | 50,000 |  | $29.98 - $37.61 |  | $ | 31.51 |  |  |  |  |  |  |
Forfeited/Expired—2009 |  |  | (32,812 | ) | $25.52 - $53.16 |  | $ | 44.33 |  |  |  |  |  |  |
Exercised—2009 |  |  | (464,601 | ) | $7.38 - $35.87 |  | $ | 11.25 |  |  |  |  |  |  |
Outstanding at December 31, 2009 |  |  | 1,501,906 |  | $8.63 - $57.00 |  | $ | 30.29 |  |  | 5 |  | $ | 14,579 |
Forfeited/Expired—2010 |  |  | (34,966 | ) | $41.33 - $49.60 |  | $ | 46.59 |  |  |  |  |  |  |
Exercised—2010 |  |  | (278,656 | ) | $8.63 - $42.07 |  | $ | 16.42 |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 1,188,284 |  | $9.54 - $57.00 |  | $ | 33.07 |  |  | 5 |  | $ | 7,987 |
Forfeited/Expired—2011 |  |  | (51,598 | ) | $22.49 - $50.59 |  | $ | 42.82 |  |  |  |  |  |  |
Exercised—2011 |  |  | (191,264 | ) | $9.54 - $30.25 |  | $ | 12.82 |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 945,422 |  | $13.40 - $57.00 |  | $ | 36.63 |  |  | 4 |  | $ | 510 |
Exercisable at December 31, 2009 |  |  | 1,389,141 |  | (1) |  | $ | 29.42 |  |  |  |  |  |  |
Exercisable at December 31, 2010 |  |  | 1,188,284 |  | (2) |  | $ | 33.07 |  |  |  |  |  |  |
Exercisable at December 31, 2011 |  |  | 945,422 |  | (3) |  | $ | 36.63 |  |  |  |  |  |  |
(1) 83,441 of these options had an exercise price ranging from $8.63 to $10.99; 345,792 had an exercise price ranging from $11.00 to $16.99; 172,914 had an exercise price ranging from $17.00 to $25.99; 190,287 had an exercise price ranging from $26.00 to $34.99; 343,040 had an exercise price ranging from $35.00 to $43.99; and 253,667 had an exercise price ranging from $44.00 to $57.00. (2) 231,946 of these options had an exercise price ranging from $9.54 to $16.73; 246,103 had an exercise price ranging from $16.74 to $30.04; 205,012 had an exercise price ranging from $30.05 to $41.28; 253,607 had an exercise price ranging from $41.29 to $45.24; and 251,616 had an exercise price ranging from $45.25 to $57. (3) 53,957 of these options had an exercise price ranging from $13.40 to $16.73; 225,903 had an exercise price ranging from $16.74 to $30.04; 198,762 had an exercise price ranging from $30.05 to $41.28; and 466,800 had an exercise price ranging from $41.29 to $57.00.
Schedule of weighed average assumptions computing grant date fair values for stock options |
Weighted average fair value of grants on grant date |  | $ | 10.15 |
Risk-free interest rate(1) |  |  | 2.20 | %
Expected life-years |  |  | 5.32 |
Expected volatility(2) |  |  | 47.71 | %
Expected dividend yield(3) |  |  | 3.77 | %
(1) Ranged from 2.08% to 2.70%. (2) Ranged from 47.60% to 48.17%. (3) Ranged from 3.73% to 3.93%.
Reporting for share-based compensation expense |
|  | For the Years Ended December 31, |
--- | --- | --- | ---
|  | 2011 |  | 2010 |  | 2009 |
General and administrative expenses |  | $ | 9,077 |  | $ | 7,511 |  | $ | 5,964 |
Property operating expenses |  |  | 2,843 |  |  | 2,543 |  |  | 3,172 |
Capitalized to development activities |  |  | 2,347 |  |  | 1,791 |  |  | 1,466 |
Share-based compensation expense |  | $ | 14,267 |  | $ | 11,845 |  | $ | 10,602

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share units, including, but not limited to: (a) Grant date fair value (b) baseline common share value (c) expected volatility of the entity's shares, and (d) risk-free rate(s). + References No definition available. + Details
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