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Stock-Based Compensation and Other Employee Benefit Plans | 6 Months Ended
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Jun. 30, 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, under which stock options and restricted share awards are available for issuance or outstanding, including the MasTec, Inc. 2013 Incentive Plan (the "2013 Incentive Plan"), which became effective in May 2013, the 2003 Employee Stock Incentive Plan, as amended (the "2003 Employee Plans"), and the Amended and Restated 2003 Stock Incentive Plan for Non-Employees, as amended (the "2003 Non-Employee Plan, and, together with the 2003 Employee Plan, the "2003 Plans"). As a result of the effectiveness of the 2013 Incentive Plan, no additional awards will be made under the 2003 Plans. As of June 30, 2013, the 2013 Incentive Plan had 4,929,697 shares available for issuance, including 2,629,697 shares that were available for issuance under the 2003 Plans at the time they were terminated. No future equity awards can be granted under the 2003 Plans. In addition, the Company has certain employee stock purchase plans under which shares of the Company's common stock are available for purchase by eligible employees. In March 2013, the Company authorized the issuance of up to 1,000,000 new shares of MasTec, Inc. common stock to eligible employees under the MasTec, Inc. Bargaining Units Employee Stock Purchase Plan (the "2013 Bargaining Units ESPP"). The 2013 Bargaining Units ESPP became effective on July 1, 2013. The MasTec, Inc. 2011 Employee Stock Purchase Plan (the “2011 ESPP" and, together with the 2013 Bargaining Units ESPP, the "ESPPs"), which became effective on July 1, 2011, also provides for the issuance of up to 1,000,000 shares of MasTec, Inc. common stock for eligible employees, of which 805,278 shares remained available for issuance as of June 30, 2013. Under all stock-based compensation plans in effect as of June 30, 2013, there were a total of 5,734,975 shares available for grant. 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 June 30, 2013 was approximately $20.5 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 $0.4 million and $1.1 million for the three and six month periods ended June 30, 2013 and $1.9 million and $2.1 million for the three and six month periods ended June 30, 2012, respectively. During the second quarter of 2013, the Company entered into an agreement with the previous owners of EC Source to establish an incentive program for its employees and granted 350,000 restricted share awards (the “EC Source Share Award”). The former owners of EC Source contributed cash and shares of MasTec common stock to the Company in connection with the EC Source Share Award. In the event that shares granted under the EC Source Share Award are forfeited prior to vesting, the former owners of EC Source will be re-issued the pro-rata percentage of the former owners' contributed shares to total shares awarded under the EC Source share grant. As of June 30, 2013, the Company did not anticipate the occurrence of any such forfeitures. See Note 3 - Acquisitions and Other Investments of the Company's consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2012 for details of the EC Source acquisition. Following is a summary of restricted share award activity during the periods indicated:
| Restricted Shares |  | Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, as of December 31, 2011 | 715,030 |  |  | $ | 14.44 |
Granted | 175,004 |  |  | 18.05 |
Vested | (129,126 | ) |  | 12.44 |
Canceled/forfeited | (17,615 | ) |  | 15.27 |
Non-vested restricted shares, as of June 30, 2012 | 743,293 |  |  | $ | 15.61 |
Non-vested restricted shares, as of December 31, 2012 | 782,281 |  |  | $ | 19.10 |
Granted | 425,246 |  |  | 31.03 |
Vested | (35,772 | ) |  | 22.94 |
Canceled/forfeited | (14,437 | ) |  | 15.19 |
Non-vested restricted shares, as of June 30, 2013 | 1,157,318 |  |  | $ | 23.41 |
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. All outstanding stock options were fully vested as of December 31, 2011. The following is a summary of stock option activity during the periods indicated:
As of and for the Six Months Ended June 30, 2013 and 2012: | Stock Options |  | Per Share 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 | (32,000 | ) |  | 8.65 |  |  |  |  |
Canceled/forfeited | — |  |  | — |  |  |  |  |
Options outstanding as of June 30, 2012 | 1,413,774 |  |  | $ | 10.29 |  |  | 2.71 |  | $ | 6.7 |
Options exercisable as of June 30, 2012 | 1,413,774 |  |  | $ | 10.29 |  |  | 2.71 |  | $ | 6.7 |
Options outstanding as of December 31, 2012 | 1,053,825 |  |  | $ | 10.55 |  |  | 2.31 |  | $ | 15.2 |
Exercised | (313,303 | ) |  | 10.83 |  |  |  |  |
Canceled/forfeited | — |  |  | — |  |  |  |  |
Options outstanding as of June 30, 2013 | 740,522 |  |  | $ | 10.43 |  |  | 1.83 |  | $ | 16.6 |
Options exercisable as of June 30, 2013 | 740,522 |  |  | $ | 10.43 |  |  | 1.83 |  | $ | 16.6 |
(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 period ended June 30, 2013, 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 $2.2 million. The intrinsic value of options exercised during the three months ended June 30, 2012 was immaterial. The intrinsic value of options exercised during the six month periods ended June 30, 2013 and June 30, 2012 totaled $5.7 million and $0.3 million, respectively. Proceeds from options exercised during the three month periods ended June 30, 2013 and 2012 totaled $1.5 million and $0.2 million, respectively, and totaled $3.4 million and $0.3 million for the six months periods ended June 30, 2013 and 2012, respectively. Employee Stock Purchase Plan The Company's ESPPs allow qualified employees to purchase MasTec, Inc. common stock at 85% of the fair market value of the common stock at the lower of (i) the date of commencement of the offering period or (ii) the last day of the exercise period, as defined in the plan document. Through June 30, 2013, the offering period was an annual period, composed of four interim exercise periods. Effective July 1, 2013, the offering period became quarterly. The following table summarizes employee stock purchase plan activity for the periods indicated:
| For the Six Months Ended June 30, 2013 |  | For the Six Months Ended June 30, 2012
Cash proceeds (in millions) | $ | 5.5 |  |  | $ | 0.5 |
Number of common shares (in thousands) | 416.4 |  |  | 34.9 |
Weighted average price per share | $ | 13.10 |  |  | $ | 14.02 |
Weighted average grant date fair value per share | $ | 5.49 |  |  | $ | 4.08 |
The fair value of purchases under the Company's ESPP is estimated using the Black-Scholes option-pricing valuation model. Shares Withheld for Payroll Taxes In connection with the issuance of shares under share-based compensation awards, at the employees' election, the Company withholds shares of common stock for tax withholding obligations. These shares are repurchased or withheld in conjunction with net share settlement of the related awards upon vesting, for restricted stock awards, or upon exercise, for stock options. Withheld shares, which are valued at the share price on the date of vesting or exercise, as applicable, are classified as a reduction to additional paid-in capital. Stock Based Compensation Expense and Related Tax Benefit Details of stock based compensation expense and related tax benefit for the periods indicated are as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Stock based compensation expense | $ | 4.3 |  |  | $ | 1.2 |  |  | $ | 6.6 |  |  | $ | 2.2 |
Income tax benefit from stock based compensation | 1.8 |  |  | 0.4 |  |  | 3.3 |  |  | 0.9 |
Excess tax benefit from stock based compensation (1) | $ | 0.8 |  |  | $ | — |  |  | $ | 1.5 |  |  | $ | 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 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 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 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 5: 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 6: 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 8: 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. + Details
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