Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities
Net income	$ 154,343	$ 151,216
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,110	28,738
Stock option expense	10,729	9,360
Benefit for deferred income taxes	(6,085)	(1,344)
Litigation settlement	6,000
Noncash long-term incentive compensation	4,184	4,176
Asset impairment loss	2,266
Noncash directors' compensation	767	766
Amortization of debt issuance costs	229	361
Amortization of restricted stock awards		446
Changes in operating assets and liabilities:
Decrease in accounts receivable	10,558	4,637
Increase in inventories	(1,649)	(429)
Increase in prepaid expenses	(6,836)	(1,518)
Increase in accounts payable and other current liabilities	28,622	12,182
Net change in lease assets and liabilities	1,311
Change in current income taxes	(81)	23,858
Increase in other assets	(8,145)	(9,441)
Increase in other liabilities	9,045	7,190
Other sources	1,277	410
Net cash provided by operating activities	237,645	230,608
Cash Flows from Investing Activities
Business combinations	(138,010)	(12,875)
Capital expenditures	(39,753)	(36,554)
Other sources	101	480
Net cash used by investing activities	(177,662)	(48,949)
Cash Flows from Financing Activities
Proceeds from revolving line of credit	400,700	428,150
Payments on revolving line of credit	(359,900)	(324,350)
Purchases of treasury stock	(71,926)	(121,976)
Capital stock surrendered to pay taxes on stock-based compensation	(26,108)	(24,763)
Proceeds from exercise of stock options	23,383	23,079
Dividends paid	(14,657)	(13,850)
Change in cash overdrafts payable	(7,535)	(15,307)
Payments on other long-term debt		(75,000)
Debt issuance costs		(985)
Other sources/(uses)	295	(319)
Net cash used by financing activities	(55,748)	(125,321)
Increase in Cash and Cash Equivalents	4,235	56,338
Cash and cash equivalents at beginning of year	4,831	11,121
Cash and cash equivalents at end of period	$ 9,066	$ 67,459

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