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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

During the three and nine months ended September 30, 2019 and 2018, 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, 2019				September 30, 2018				September 30, 2019				September 30, 2018
Stock-settled stock appreciation rights granted	—				9,415				213,618				509,046
Weighted-average fair value	$	—			$	17.40			$	16.36			$	18.38
Restricted stock units granted	6,256				2,686				181,800				119,457
Weighted-average fair value	$	47.95			$	61.41			$	54.41			$	62.72
Performance-based awards granted	—				—				126,874				44,144
Weighted-average fair value	$	—			$	—			$	54.64			$	62.80

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

The following table sets forth a summary of stock-settled stock appreciation rights and related information for the nine months ended September 30, 2019:

	Awards			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (In years)		Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2018	2,351,633			$	59.26
Granted	213,618			54.63
Exercised	(108,022	)		34.84
Forfeited	(87,351	)		65.96
Outstanding at September 30, 2019	2,369,878			59.71				5.8		$	4,948
Exercisable at September 30, 2019	1,749,201			$	59.00			4.9		$	4,948

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table sets forth a summary of time-based restricted stock units and related information for the nine months ended September 30, 2019:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2018	327,798			$	57.87
Granted	181,800			54.41
Vested	(118,560	)		44.58
Forfeited	(17,736	)		59.57
Unvested at September 30, 2019	373,302			$	60.25

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

The following table sets forth a summary of performance-based awards for the nine months ended September 30, 2019:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2018	138,896			$	59.33
Granted	126,874			54.64
Vested	(25,696	)		42.44
Forfeited	(44,769	)		52.15
Unvested at September 30, 2019	195,305			$	60.24

Stock Appreciation Rights (SARs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

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, 2019		September 30, 2018			September 30, 2019			September 30, 2018
Risk free interest rate	n/a		2.8	%		2.5	%		2.5	%
Expected life (in years)	n/a		5			5			5
Expected volatility	n/a		28	%		29	%		28	%

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