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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2018

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 presented:

	Year Ended December 31,
	2018													2017							2016
	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	2,238,607			$	57.75									2,439,487			$	52.62			2,567,021			$	54.47
Granted	509,046			62.68										455,807			71.21				709,999			42.63
Exercised	(192,700	)		40.74										(495,181	)		42.19				(526,818	)		41.54
Canceled	(203,320	)		68.69										(161,506	)		66.06				(310,715	)		63.71
End of year	2,351,633			59.26				6.1		$	6,514			2,238,607			57.75				2,439,487			52.62
Exercisable at end of year	1,453,932			$	57.93			4.6		$	5,623			1,331,580			$	56.96			1,549,350			$	53.35

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

the fair value of stock-settled stock appreciation rights granted during the years presented:

	Year Ended December 31,
	2018		2017		2016
Stock-settled stock appreciation rights granted	509,046		455,807		709,999
Risk free interest rate	2.5%		1.9%		1.2%
Expected life (in years)	5		5		5
Expected volatility	28%		29%		32%

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

The following table sets forth a summary of performance-based awards and related information for the years presented:

	Year Ended December 31,
	2018							2017							2016
	Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value
Unvested at beginning of year	148,508			$	60.23			149,320			$	60.36			114,520			$	76.48
Granted	44,144			62.80				39,978			76.63				91,768			47.00
Vested	—			—				—			—				—			—
Forfeited	(53,756	)		64.67				(40,790	)		76.77				(56,968	)		71.25
Unvested at end of year	138,896			$	59.33			148,508			$	60.23			149,320			$	60.36

The following table sets forth a summary of time-based restricted stock units and related information for the years presented:

	Year Ended December 31,
	2018							2017							2016
	Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value				Awards			Weighted-Average Fair Value
Unvested at beginning of year	290,054			$	58.11			257,096			$	57.47			175,411			$	74.52
Granted	122,062			62.40				100,993			71.33				162,256			44.45
Vested	(64,166	)		67.91				(44,720	)		84.57				(60,015	)		72.41
Forfeited	(20,152	)		58.15				(23,315	)		57.52				(20,556	)		59.15
Unvested at end of year	327,798			$	57.87			290,054			$	58.11			257,096			$	57.47

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

The following table sets forth the assumptions used to estimate the fair value of performance shares granted during the years presented:

	Year ended December 31,
	2018				2017				2016
Grant date share price	$	62.80			$	71.67			$	42.44
WESCO expected volatility	n/a				29		%		26		%
Peer group median volatility	n/a				24		%		24		%
Risk-free interest rate	n/a				1.5		%		0.9		%
Correlation of peer company returns	n/a				114		%		122		%

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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.

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

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