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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 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
	March 31, 2019				March 31, 2018
Stock-settled stock appreciation rights granted	213,618				491,229
Weighted-average fair value	$	16.36			$	18.40
Restricted stock units granted	175,544				114,269
Weighted-average fair value	$	54.64			$	62.81
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 three months ended March 31, 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	(51,635	)		35.11
Forfeited	(26,236	)		70.00
Outstanding at March 31, 2019	2,487,380			59.25				6.3		$	9,222
Exercisable at March 31, 2019	1,815,662			$	58.38			5.3		$	9,217

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 three months ended March 31, 2019:

	Awards			Weighted- Average Fair Value
Unvested at December 31, 2018	327,798			$	57.87
Granted	175,544			54.64
Vested	(112,500	)		43.58
Forfeited	(1,565	)		57.49
Unvested at March 31, 2019	389,277			$	60.48

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

The following table sets forth a summary of performance-based awards for the three months ended March 31, 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 March 31, 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
	March 31, 2019			March 31, 2018
Risk free interest rate	2.5	%		2.5	%
Expected life (in years)	5			5
Expected volatility	29	%		28	%

Performance Shares [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]

X

- Definition

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

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