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STOCK-BASED COMPENSATION | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION WESCO’s stock-based employee compensation plans are comprised of stock-settled stock appreciation rights, restricted stock units and performance-based awards. Compensation cost for all stock-based awards is measured at fair value on the date of grant and compensation cost is recognized, net of estimated forfeitures, over the service period for awards expected to vest. The fair value of stock-settled stock appreciation rights and performance-based awards with market conditions is determined using the Black-Scholes and Monte Carlo simulation models, respectively. The fair value of restricted stock units and performance-based awards with performance conditions is determined by the grant-date closing price of WESCO’s common stock. The forfeiture assumption is based on WESCO’s historical employee behavior that is reviewed on an annual basis. No dividends are assumed. During the three and nine months ended September 30, 2016 and 2015, WESCO granted the following stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:
| Three Months Ended |  | Nine Months Ended
| September 30, 2016 |  | September 30, 2015 |  | September 30, 2016 |  | September 30, 2015
Stock-settled stock appreciation rights granted | 1,745 |  |  | — |  |  | 709,999 |  |  | 394,182 |
Weighted-average fair value | $ | 16.68 |  |  | $ | — |  |  | $ | 12.91 |  |  | $ | 21.68 |
Restricted stock units granted | — |  |  | 2,730 |  |  | 143,305 |  |  | 81,022 |
Weighted-average fair value | $ | — |  |  | $ | 54.94 |  |  | $ | 42.45 |  |  | $ | 69.05 |
Performance-based awards granted | — |  |  | — |  |  | 91,768 |  |  | 59,661 |
Weighted-average fair value | $ | — |  |  | $ | — |  |  | $ | 47.00 |  |  | $ | 67.81 |
The fair value of stock-settled stock appreciation rights was estimated using the following weighted-average assumptions:
| Three Months Ended |  | Nine Months Ended
| September 30, 2016 |  | September 30, 2015 |  | September 30, 2016 |  | September 30, 2015
Risk free interest rate | 1.3 | % |  | — | % |  | 1.2 | % |  | 1.6 | %
Expected life (in years) | 5 |  |  | 0 |  |  | 5 |  |  | 5 |
Expected volatility | 31 | % |  | — | % |  | 32 | % |  | 32 | %
The risk-free interest rate is based on the U.S. Treasury Daily Yield Curve rates as of the grant date. The expected life is based on historical exercise experience and the expected volatility is based on the volatility of the Company's daily stock prices over a five-year period preceding the grant date. The following table sets forth a summary of stock-settled stock appreciation rights and related information for the nine months ended September 30, 2016:
| Awards |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2015 | 2,567,021 |  |  | $ | 54.47 |  |  |  |  |
Granted | 709,999 |  |  | 42.63 |  |  |  |  |
Exercised | (312,244 | ) |  | 32.45 |  |  |  |  |
Forfeited | (279,190 | ) |  | 64.07 |  |  |  |  |
Outstanding at September 30, 2016 | 2,685,586 |  |  | 52.89 |  |  | 5.6 |  | $ | 33,729 |
Exercisable at September 30, 2016 | 1,776,910 |  |  | $ | 53.65 |  |  | 3.8 |  | $ | 21,472 |
The following table sets forth a summary of time-based restricted stock units and related information for the nine months ended September 30, 2016:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2015 | 175,411 |  |  | $ | 74.52 |
Granted | 143,305 |  |  | 42.45 |
Vested | (59,904 | ) |  | 72.43 |
Forfeited | (17,100 | ) |  | 59.69 |
Unvested at September 30, 2016 | 241,712 |  |  | $ | 57.29 |
Performance shares are awards for which the vesting will occur based on market or performance conditions. The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2016:
| Awards |  | Weighted- Average Fair Value
Unvested at December 31, 2015 | 114,520 |  |  | $ | 76.48 |
Granted | 91,768 |  |  | 47.00 |
Vested | — |  |  | — |
Forfeited | (53,394 | ) |  | 71.89 |
Unvested at September 30, 2016 | 152,894 |  |  | $ | 60.39 |
The fair value of the performance shares granted during the nine months ended September 30, 2016 was estimated using the following weighted-average assumptions:
Weighted-Average Assumptions
Grant date share price | $ | 42.44 |
WESCO expected volatility | 26.3 | %
Peer group median volatility | 24.2 | %
Risk-free interest rate | 0.89 | %
Correlation of peer company returns | 121.5 | %
The unvested performance-based awards in the table above include 76,447 shares in which vesting of the ultimate number of shares is dependent upon WESCO's total stockholder return in relation to the total stockholder return of a select group of peer companies over a three-year period. These awards are accounted for as awards with market conditions; compensation cost is recognized over the service period, regardless of whether the market conditions are achieved and the awards ultimately vest. Vesting of the remaining 76,447 shares of performance-based awards in the table above is dependent upon the three-year average growth rate of WESCO's net income. These awards are accounted for as awards with performance conditions; compensation cost is recognized over the performance period based upon WESCO's determination of whether it is probable that the performance targets will be achieved. WESCO recognized $3.4 million and $1.9 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the three months ended September 30, 2016 and 2015, respectively. WESCO recognized $10.4 million and $9.7 million of non-cash stock-based compensation expense, which is included in selling, general and administrative expenses, for the nine months ended September 30, 2016 and 2015, respectively. As of September 30, 2016, there was $20.5 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements for all awards previously made, of which approximately $3.5 million is expected to be recognized over the remainder of 2016, $10.4 million in 2017, $6.0 million in 2018 and $0.6 million in 2019. During the nine months ended September 30, 2016 and 2015, the total intrinsic value of all awards exercised was $10.6 million and $15.4 million, respectively. The gross deferred tax benefit associated with the exercise of awards for the nine months ended September 30, 2016 and 2015 totaled $4.0 million and $5.6 million, respectively, and was recorded as an increase to additional capital.

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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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: 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=68057994&loc=d3e25284-112666 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: 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 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 + Details
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