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Stock-Based Compensation and Other Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2013
Share-based Compensation [Abstract] |
Stock-Based Compensation and Other Employee Benefit Plans | Stock-Based Compensation and Other Employee Benefit Plans The Company has certain stock-based compensation plans with stock options and restricted share awards outstanding as of March 31, 2013. Under plans currently in effect, there were a total of 3,821,690 shares available for grant as of March 31, 2013. Restricted Share Awards MasTec grants restricted share awards, which are valued based on the market price of MasTec common stock on the date of grant. Total unearned compensation related to restricted share awards as of March 31, 2013 was approximately $9.4 million, which is expected to be recognized over a weighted average period of approximately 2 years. T he total intrinsic value, or fair value, of restricted share awards that vested, which is based on the market price on the date of vesting, was $0.7 million and $0.2 million for the three month periods ended March 31, 2013 and 2012, respectively. Following is a summary of restricted share award activity during the periods indicated:
| Restricted Shares |  | Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2011 | 716,780 |  |  | $ | 14.45 |
Granted | 139,353 |  |  | 18.55 |
Vested | (12,892 | ) |  | 14.60 |
Canceled/forfeited | (9,000 | ) |  | 15.08 |
Non-vested restricted shares, as of March 31, 2012 | 834,241 |  |  | $ | 15.12 |
Non-vested restricted shares, as of December 31, 2012 | 792,396 |  |  | $ | 19.07 |
Granted | 21,267 |  |  | 27.10 |
Vested | (23,767 | ) |  | 20.35 |
Canceled/forfeited | — |  |  | — |
Non-vested restricted shares, as of March 31, 2013 | 789,896 |  |  | $ | 19.24 |
Stock Options The Company has granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans at not less than the fair market value of the underlying stock on the date of grant. No stock options have been granted since 2006. The following is a summary of stock option activity during the periods indicated:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (1) (in millions)
Options outstanding as of December 31, 2011 | 1,445,774 |  |  | $ | 10.25 |  |  | 3.16 |  | $ | 10.3 |
Exercised | (20,000 | ) |  | 5.37 |  |  |  |  |
Canceled/forfeited | — |  |  | — |  |  |  |  |
Options outstanding as of March 31, 2012 | 1,425,774 |  |  | $ | 10.32 |  |  | 2.97 |  | $ | 11.1 |
Options exercisable as of March 31, 2012 | 1,425,774 |  |  | $ | 10.32 |  |  | 2.97 |  | $ | 11.1 |
Options outstanding as of December 31, 2012 | 1,053,825 |  |  | $ | 10.55 |  |  | 2.31 |  | $ | 15.2 |
Exercised | (194,200 | ) |  | 10.02 |  |  |  |  |
Canceled/forfeited | — |  |  | — |  |  |  |  |
Options outstanding as of March 31, 2013 | 859,625 |  |  | $ | 10.66 |  |  | 2.06 |  | $ | 15.9 |
Options exercisable as of March 31, 2013 | 859,625 |  |  | $ | 10.66 |  |  | 2.06 |  | $ | 15.9 |
(1) | Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.
The total intrinsic value of options exercised during the three month periods ended March 31, 2013 and 2012, which is based on the difference between the exercise price and the market price of the Company’s stock at the date of exercise, was $3.5 million and $0.3 million, respectively. Proceeds from options exercised during the three month periods ended March 31, 2013 and 2012 totaled $1.9 million and $0.1 million, respectively. Stock Based Compensation Expense and Related Tax Benefit (Expense) Details of stock based compensation expense and related tax benefit (expense) for the periods indicated are as follows (in millions):
| For the Three Months Ended March 31,
| 2013 |  | 2012
Stock based compensation expense: |  |  |
Restricted share awards and other | $ | 2.4 |  |  | $ | 1.0 |
Stock options | — |  |  | — |
Total stock based compensation expense | $ | 2.4 |  |  | $ | 1.0 |
Income tax benefit (expense) from stock based compensation: |  |  |
Restricted share awards and other | $ | 0.7 |  |  | $ | 0.4 |
Stock options | 0.8 |  |  | 0.1 |
Total income tax benefit (expense) from stock based compensation | $ | 1.5 |  |  | $ | 0.5 |
Excess tax benefit from stock based compensation: |  |  |
Vested restricted shares and other (1) | $ | 0.1 |  |  | $ | — |
Stock options exercised (1) | 0.8 |  |  | 0.1 |
Total excess tax benefit from stock based compensation (1) | $ | 0.9 |  |  | $ | 0.1 |
(1) | Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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