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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 six months ended June 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								Six Months Ended
	June 30, 2019				June 30, 2018				June 30, 2019				June 30, 2018
Stock-settled stock appreciation rights granted	—				8,402				213,618				499,631
Weighted-average fair value	$	—			$	17.85			$	16.36			$	18.39
Restricted stock units granted	—				2,502				175,544				116,771
Weighted-average fair value	$	—			$	59.95			$	54.64			$	62.75
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 six months ended June 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	(106,044	)		34.70
Forfeited	(44,877	)		70.10
Outstanding at June 30, 2019	2,414,330			59.73				6.2		$	6,739
Exercisable at June 30, 2019	1,749,679			$	59.01			5.2		$	6,739

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 six months ended June 30, 2019:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2018	327,798			$	57.87
Granted	175,544			54.64
Vested	(116,858	)		44.32
Forfeited	(2,937	)		56.16
Unvested at June 30, 2019	383,547			$	60.46

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

The following table sets forth a summary of performance-based awards for the six months ended June 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	(35,486	)		50.79
Unvested at June 30, 2019	204,588			$	60.11

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					Six Months Ended
	June 30, 2019		June 30, 2018			June 30, 2019			June 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	%

X

- Definition

Tabular disclosure of the changes in outstanding nonvested performance-based units.

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