Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from (used for) operating activities:
Net income	$ 3,856	$ 33,759	$ 18,963
Adjustments to reconcile net income to net cash from operating activities -
Depreciation and amortization	19,548	18,035	18,587
(Gain) loss on disposition of property and equipment	(222)	64	(52)
Stock-based compensation	2,188	1,529	1,096
Intangibles and other long-term assets	(3,835)	1,970	(2,874)
Deferred income taxes and other long-term liabilities	1,220	(1,467)	(8,988)
	22,755	53,890	26,732
Changes in working capital:
Accounts receivable	42,141	(35,906)	(30,835)
Inventories	95,836	(78,662)	(20,781)
Prepaid expenses and other	2,464	47	(1,303)
Accounts payable	(33,651)	2,898	3,918
Change in outstanding checks	7,053	1,038	658
Accrued payroll and other accrued liabilities	(7,040)	6,194	2,570
	106,803	(104,391)	(45,773)
Net cash from (used for) operating activities	129,558	(50,501)	(19,041)
Cash flows from (used for) investing activities:
Acquisitions	(11,133)	(21,907)
Capital expenditures	(10,165)	(25,715)	(10,160)
Proceeds from disposition of property and equipment	269	126	991
Net cash used for investing activities	(21,029)	(47,496)	(9,169)
Cash flows from (used for) financing activities:
Credit facility revolver borrowings	536,944	597,867	387,220
Credit facility revolver repayments	(646,549)	(491,572)	(355,584)
Principal payments under capital lease obligation		(7)
Industrial revenue bond repayments		(930)	(895)
Credit facility fees and expenses	(100)	(171)	(969)
Proceeds from employee stock options			10
Repurchase of common stock	(1,522)
Dividends paid	(879)	(880)	(878)
Net cash from (used for) financing activities	(112,106)	104,307	28,904
Cash and cash equivalents:
Net change	(3,577)	6,310	694
Beginning balance	9,319	3,009	2,315
Ending balance	5,742	9,319	3,009
Cash paid during the period
Interest paid	10,951	10,241	6,433
Income taxes paid	$ 460	$ 11,316	$ 9,357