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Share-Based Compensation and Other Compensation Matters (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of restricted share transactions under the entity's share-based compensation plans | The following table summarizes restricted share transactions under the share-based compensation plans for 2012, 2013 and 2014:
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2011 |  | 648,378 |  |  | $ | 33.13 |
Granted |  | 177,662 |  |  | 23.64 |
Forfeited |  | (17,019 | ) |  | 31.43 |
Vested |  | (374,378 | ) |  | 32.72 |
Unvested at December 31, 2012 |  | 434,643 |  |  | 29.67 |
Granted |  | 193,833 |  |  | 25.91 |
Forfeited |  | (9,541 | ) |  | 27.59 |
Vested |  | (241,487 | ) |  | 30.97 |
Unvested at December 31, 2013 |  | 377,448 |  |  | 26.96 |
Granted |  | 216,607 |  |  | 26.73 |
Forfeited |  | (21,335 | ) |  | 25.10 |
Vested |  | (182,213 | ) |  | 28.56 |
Unvested at December 31, 2014 |  | 390,507 |  |  | $ | 26.19 |
Unvested shares as of December 31, 2014 that are expected to vest |  | 375,686 |  |  | $ | 26.18 |
Schedule of PSU's Granted | Our Board of Trustees made the following grants of PSUs to executives from 2011 through 2014 (dollars in thousands):
Grant Date |  | Number of PSUs Granted |  | Performance Period Commencement Date |  | Performance Period End Date |  | Grant Date Fair Value |  | Number of PSUs Outstanding as of December 31, 2014
3/3/2011 |  | 56,883 |  |  | 3/3/2011 |  | 3/2/2014 |  | $ | 2,796 |  |  | — |
3/1/2012 |  | 54,070 |  |  | 1/1/2012 |  | 12/31/2014 |  | 1,772 |  |  | 54,070 |
3/1/2013 |  | 69,579 |  |  | 1/1/2013 |  | 12/31/2015 |  | 1,867 |  |  | 69,579 |
3/6/2014 |  | 49,103 |  |  | 1/1/2014 |  | 12/31/2016 |  | 1,723 |  |  | 49,103 |
Schedule of payouts for defined performance under performance-based awards of share-based compensation | The number of PSUs earned (“earned PSUs”) at the end of the performance period will be determined based on the percentile rank of COPT’s total shareholder return relative to a peer group of companies, as set forth in the following schedule:
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 | The grant date fair value and certain of the assumptions used in the Monte Carlo models for the PSUs granted in 2012, 2013 and 2014 are set forth below:
|  | For the Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
Grant date fair value |  | $ | 35.09 |  |  | $ | 26.84 |  |  | $ | 32.77 |
Baseline common share value |  | $ | 26.52 |  |  | $ | 25.85 |  |  | $ | 24.39 |
Expected volatility of common shares |  | 28.6 | % |  | 29.5 | % |  | 43.2 | %
Risk-free interest rate |  | 0.66 | % |  | 0.33 | % |  | 0.41 | %
Summary of stock option transactions under the entity's share-based compensation plans | The following table summarizes option transactions under the share-based compensation plans for 2012, 2013 and 2014 (dollars in thousands, except per share data):
|  | 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, 2011 |  | 945,422 |  |  | $13.40 - $57.00 |  | $ | 36.63 |  |  | 4 |  | $ | 510 |
Forfeited/Expired – 2012 |  | (85,588 | ) |  | $25.52 - $57.00 |  | $ | 42.98 |  |  |  |  |
Exercised – 2012 |  | (61,624 | ) |  | $13.40 - $22.49 |  | $ | 15.08 |  |  |  |  |
Outstanding at December 31, 2012 |  | 798,210 |  |  | $13.60 - $57.00 |  | $ | 37.62 |  |  | 3 |  | $ | 325 |
Forfeited/Expired – 2013 |  | (117,952 | ) |  | $18.08 - $51.62 |  | $ | 40.91 |  |  |  |  |
Exercised – 2013 |  | (39,331 | ) |  | $13.60 - $26.24 |  | $ | 19.67 |  |  |  |  |
Outstanding at December 31, 2013 |  | 640,927 |  |  | $19.63 - $56.00 |  | $ | 38.11 |  |  | 2 |  | $ | 68 |
Forfeited/Expired – 2014 |  | (18,303 | ) |  | $22.34 - $49.60 |  | $ | 42.12 |  |  |  |  |
Exercised – 2014 |  | (62,888 | ) |  | $19.63 - $28.15 |  | $ | 23.70 |  |  |  |  |
Outstanding at December 31, 2014 |  | 559,736 |  |  | $25.52 - $56.00 |  | $ | 39.60 |  |  | 2 |  | $ | 167 |
Exercisable at December 31, 2012 |  | 798,210 |  |  | (1) |  | $ | 37.62 |  |  |  |  |
Exercisable at December 31, 2013 |  | 640,927 |  |  | (2) |  | $ | 38.11 |  |  |  |  |
Exercisable at December 31, 2014 |  | 559,736 |  |  | (3) |  | $ | 39.60 |  |  |  |  |
(1) | 9,500 of these options had an exercise price ranging from $13.60 to $16.73; 204,736 had an exercise price ranging from $16.74 to $30.04; 180,962 had an exercise price ranging from $30.05 to $41.28; and 403,012 had an exercise price ranging from $41.29 to $57.00.
(2) | 171,288 of these options had an exercise price ranging from $19.63 to $30.04; 145,187 had an exercise price ranging from$30.05 to $41.28; 160,402 had an exercise price ranging from $41.29 to $42.74; and 164,050 had an exercise price ranging from $42.75 to $56.00.
(3) | 105,672 of these options had an exercise price ranging from $25.52 to $30.04; 142,862 had an exercise price ranging from$30.05 to $41.28; 158,902 had an exercise price ranging from $41.29 to $42.74; and 152,300 had an exercise price ranging from $42.75 to $56.00.
Reporting for share-based compensation expense | The table below sets forth our reporting for share based compensation expense (in thousands):
|  | For the Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
General, administrative and leasing expenses |  | $ | 5,307 |  |  | $ | 5,412 |  |  | $ | 8,611 |
Property operating expenses |  | 857 |  |  | 1,118 |  |  | 1,371 |
Capitalized to development activities |  | 886 |  |  | 1,075 |  |  | 1,202 |
Share-based compensation expense |  | $ | 7,050 |  |  | $ | 7,605 |  |  | $ | 11,184 |

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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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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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