Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net Income	$ 30,912	$ 32,637
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation	7,001	6,649
Amortization	336	375
Share-based compensation	3,654	3,259
Equity earnings in unconsolidated investments, net	(88)	(65)
Impairment of goodwill and other assets	6,944	0
Other	3,715	512
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	(124,542)	(103,122)
Product inventories	(156,856)	(128,206)
Prepaid expenses and other assets	4,633	(1,427)
Accounts payable	256,874	230,030
Accrued expenses and other current liabilities	(12,855)	(11,838)
Net Cash Provided by operating activities	19,728	28,804
Investing activities
Acquisition of businesses, net of cash acquired	(13,642)	(9,370)
Purchases of property and equipment, net of sale proceeds	(8,340)	(6,739)
Net cash used in investing activities	(21,982)	(16,109)
Financing activities
Proceeds from revolving line of credit	248,700	206,190
Payments on revolving line of credit	(256,543)	(253,249)
Proceeds from asset-backed financing	97,400	80,100
Payments on asset-backed financing	(17,300)	(13,500)
Payments on term facility	2,313	0
Proceeds from short-term borrowings and current portion of long-term debt	6,479	13,713
Payments on short-term borrowings and current portion of long-term debt	(1,871)	(1,148)
Payments of deferred and contingent acquisition consideration	(281)	(311)
Payments of deferred financing costs	(12)	0
Proceeds from stock issued under share-based compensation plans	6,358	7,071
Payments of cash dividends	(22,147)	(17,819)
Purchases of treasury stock	(66,619)	(23,097)
Net cash used in financing activities	(8,149)	(2,050)
Effect of exchange rate changes on cash and cash equivalents	(372)	1,578
Change in cash and cash equivalents	(10,775)	12,223
Cash and cash equivalents at beginning of period	28,583	16,358
Cash and cash equivalents at end of period	$ 17,808	$ 28,581

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

+ Details

Name:	us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

+ Details

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration