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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the years indicated:

	2016													2015							2014
	Awards			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Life		Aggregate Intrinsic Value (In thousands)				Awards			Weighted-Average Exercise Price				Awards			Weighted-Average Exercise Price
Beginning of year	2,567,021			$	54.47									2,480,745			$	50.91			2,715,651			$	45.93
Granted	709,999			42.63										394,182			69.54				274,508			85.35
Exercised	(526,818	)		41.54										(232,542	)		35.80				(485,469	)		41.58
Canceled	(310,715	)		63.71										(75,364	)		73.59				(23,945	)		70.30
End of year	2,439,487			52.62				5.6		$	40,135			2,567,021			54.47				2,480,745			50.91
Exercisable at end of year	1,549,350			$	53.35			3.8		$	24,903			2,034,263			$	49.36			1,980,767			$	44.06

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

WESCO granted the following stock-settled stock appreciation rights at the following weighted-average assumptions:

	2016		2015		2014
Stock-settled stock appreciation rights granted	709,999		394,182		274,508
Risk free interest rate	1.2%		1.6%		1.5%
Expected life (in years)	5		5		5
Expected volatility	32%		32%		39%

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table sets forth a summary of time-based restricted stock units and related information for the year ended December 31, 2016:

	Awards			Weighted-Average Fair Value
Unvested at December 31, 2015	175,411			$	74.52
Granted	162,256			44.45
Vested	(60,015	)		72.41
Forfeited	(20,556	)		59.15
Unvested at December 31, 2016	257,096			$	57.47

The following table sets forth a summary of performance-based awards for the year ended December 31, 2016:

	Awards			Weighted-Average Fair Value
Unvested at December 31, 2015	114,520			$	76.48
Granted	91,768			47.00
Vested	—			—
Forfeited	(56,968	)		71.25
Unvested at December 31, 2016	149,320			$	60.36

Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]

The fair value of the performance shares based on total stockholder return granted during the year ended December 31, 2016 were 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	121.5		%

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year.

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-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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Schedule of Share-based Payment Award, Performance-based Awards, Valuation Assumptions [Table Text Block]

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