Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 217,649	$ 165,674
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	19,499	17,947
Amortization	1,408	1,132
Share-based compensation	9,793	9,496
Equity earnings in unconsolidated investments, net	(167)	(121)
Other	3,584	1,074
Changes in operating assets and liabilities, net of effects of acquisitions:
Receivables	(93,911)	(90,204)
Product inventories	(80,142)	9,057
Prepaid expenses and other assets	143	(1,523)
Accounts payable	(40,143)	(27,328)
Accrued expenses and other current liabilities	13,547	26,816
Net cash provided by operating activities	51,260	112,020
Investing activities
Acquisition of businesses, net of cash acquired	(578)	(6,879)
Purchase of property and equipment, net of sale proceeds	(27,976)	(37,709)
Other investments, net	0	4
Net cash used in investing activities	(28,554)	(44,584)
Financing activities
Proceeds from revolving line of credit	820,967	918,338
Payments on revolving line of credit	(813,996)	(857,609)
Proceeds from asset-backed financing	193,400	156,600
Payments on asset-backed financing	(138,400)	(97,800)
Proceeds from short-term borrowings and current portion of long-term debt	16,118	25,001
Payments on short-term borrowings and current portion of long-term debt	(17,610)	(17,497)
Payments of deferred and contingent acquisition consideration	(265)	(199)
Payments of deferred financing costs	(8)	(909)
Purchase of redeemable noncontrolling interest	0	(2,573)
Proceeds from stock issued under share-based compensation plans	12,732	8,647
Payments of cash dividends	(51,371)	(43,165)
Purchases of treasury stock	(38,906)	(141,580)
Net cash used in financing activities	(17,339)	(52,746)
Effect of exchange rate changes on cash and cash equivalents	386	(248)
Change in cash and cash equivalents	5,753	14,442
Cash and cash equivalents at beginning of period	29,940	21,956
Cash and cash equivalents at end of period	$ 35,693	$ 36,398

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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