Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Schedule of New Accounting Pronouncements

Condensed Consolidated Balance Sheet

	March 31, 2018
(Stated in thousands)	As Reported		Balance without Adoption		Effect of Change
Merchandise inventory	$	616,819	$	626,629	$	(9,810	)
Other current assets	22,820		23,096		(276		)
Other non-current liabilities	22,052		32,897		(10,845		)
Retained earnings	635,933		635,135		798

Condensed Consolidated Balance Sheet

	March 31, 2018
(Stated in thousands)	As Reported		Balance without Adoption		Effect of Change
Merchandise inventory	$	616,819	$	626,629	$	(9,810	)
Other current assets	22,820		23,096		(276		)
Other non-current liabilities	22,052		32,897		(10,845		)
Retained earnings	635,933		635,135		798

Condensed Consolidated Statement of Income

	Three Months Ended   March 31, 2018
(Stated in thousands)	As Reported		Balance without Adoption		Effect of Change
Net sales	$	1,637,652	$	1,637,341	$	311
Cost of merchandise sold	1,326,233		1,325,883		350

Disaggregation of Revenue

The following table summarizes the percentages of our net sales attributable to each of our vertical markets for the three months ended March 31, 2018 and 2017:

	March 31, 2018		March 31, 2017
Construction	58.7	%	58.5	%
Industrial & Utility	22.1		21.7
CIG	19.2		19.8
Total net sales	100.0	%	100.0	%