Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operations
Net Income	$ 71,935	$ 93,313	$ 91,332
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	48,890	47,852	43,242
Deferred income taxes	14,168	19,540	4,173
Net gains on disposal of property	(118)	(1,811)	(5,918)
Net income attributable to noncontrolling interests	(327)	(234)	(264)
Changes in assets and liabilities, net of acquisitions:
Trade receivables	(97,410)	(18,608)	(3,409)
Merchandise inventory	(62,618)	16,503	(54,080)
Other current assets	(10,079)	7,245	10,698
Other non-current assets	(2,459)	1,137	(149)
Trade accounts payable	83,760	(25,534)	36,011
Accrued payroll and benefit costs	(2,072)	9,839	(16,783)
Other current liabilities	9,858	4,303	(14,596)
Other non-current liabilities	(8,400)	(41,345)	6,596
Total adjustments to net income	(26,807)	18,887	5,521
Net cash provided by operations	45,128	112,200	96,853
Cash Flows from Investing Activities
Proceeds from disposal of property	2,166	4,095	15,701
Capital expenditures for property	(41,342)	(35,215)	(74,179)
Acquisition of business, net of cash acquired	0	(59,946)	(18,093)
Net cash used by investing activities	(39,176)	(91,066)	(76,571)
Cash Flows from Financing Activities
Net increase in short-term borrowings	29,178	35,487	38,636
Repayment of long-term debt	0	(1,853)	(3,656)
Principal payments under capital leases	(4,271)	(4,810)	(4,704)
Sales of common stock	17,389	17,007	15,723
Purchases of treasury stock	(13,687)	(11,272)	(14,365)
Sales of noncontrolling interests’ common stock	627	0	401
Purchases of noncontrolling interests’ common stock	(397)	(360)	(109)
Dividends paid	(35,373)	(49,925)	(48,035)
Net cash used by financing activities	(6,534)	(15,726)	(16,109)
Net (Decrease) Increase in Cash	(582)	5,408	4,173
Cash, Beginning of Year	43,339	37,931	33,758
Cash, End of Year	42,757	43,339	37,931
Non-cash Investing and Financing Activities:
Acquisitions of equipment under capital leases	1,945	427	7,354
Cash Paid During the Year for:
Interest, net of amounts capitalized	4,219	3,737	2,024
Income taxes, net of refunds	$ 78,411	$ 36,848	$ 52,076