Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operations
Net Income	$ 93,313	$ 91,332	$ 87,686
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	47,852	43,242	39,151
Deferred income taxes	19,540	4,173	4,096
Net (gains) losses on disposal of property	(1,811)	(5,918)	24
Net income attributable to noncontrolling interests	(234)	(264)	(258)
Changes in assets and liabilities, net of acquisitions:
Trade receivables	(18,608)	(3,409)	(100,473)
Merchandise inventory	16,503	(54,080)	(12,753)
Other current assets	7,245	10,698	(18,424)
Other non-current assets	1,137	(149)	(1,008)
Trade accounts payable	(25,534)	36,011	111,172
Accrued payroll and benefit costs	9,839	(16,783)	33,929
Other current liabilities	4,303	(14,596)	(6,198)
Other non-current liabilities	(41,345)	6,596	(1,195)
Total adjustments to net income	18,887	5,521	48,063
Net cash provided by operations	112,200	96,853	135,749
Cash Flows from Investing Activities
Proceeds from disposal of property	4,095	15,701	1,398
Capital expenditures for property	(35,215)	(74,179)	(52,495)
Acquisition of business, net of cash acquired	(59,946)	(18,093)	0
Net cash used by investing activities	(91,066)	(76,571)	(51,097)
Cash Flows from Financing Activities
Net increase (decrease) in short-term borrowings	35,487	38,636	(16,100)
Repayment of long-term debt	(1,853)	(3,656)	(1,800)
Principal payments under capital leases	(4,810)	(4,704)	(3,277)
Sales of common stock	17,007	15,723	14,492
Purchases of treasury stock	(11,272)	(14,365)	(15,060)
Sales of noncontrolling interests’ common stock	0	401	0
Purchases of noncontrolling interests’ common stock	(360)	(109)	(318)
Dividends paid	(49,925)	(48,035)	(63,496)
Net cash used by financing activities	(15,726)	(16,109)	(85,559)
Net Increase (Decrease) in Cash	5,408	4,173	(907)
Cash, Beginning of Year	37,931	33,758	34,665
Cash, End of Year	43,339	37,931	33,758
Non-cash Investing and Financing Activities:
Acquisitions of equipment under capital leases	427	7,354	10,430
Acquisition of software and maintenance under financing arrangement	0	0	7,309
Cash Paid During the Year for:
Interest, net of amounts capitalized	3,737	2,024	1,448
Income taxes, net of refunds	$ 36,848	$ 52,076	$ 64,752