Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Cash flows from (used for) operating activities:
Net income (loss)	$ 33,759	[1]	$ 18,963	[1]	$ (1,078)
Adjustments to reconcile net income (loss) to net cash from operating activities -
Depreciation and amortization	18,035		18,587		19,402
(Gain) loss on disposition of property and equipment	64		(52)		(376)
Stock-based compensation	1,529		1,096		534
Intangibles and other long-term assets	1,970		(2,874)		(638)
Deferred income taxes and other long-term liabilities	(1,467)		(8,988)		(1,074)
	53,890		26,732		16,770
Changes in working capital:
Accounts receivable	(35,906)		(30,835)		(9,025)
Inventories	(78,662)		(20,781)		(47,881)
Prepaid expenses and other	47		(1,303)		1,620
Accounts payable	2,898		3,918		28,619
Change in outstanding checks	1,038		658		(4,846)
Accrued payroll and other accrued liabilities	6,194		2,570		4,930
	(104,391)		(45,773)		(26,583)
Net cash used for operating activities	(50,501)		(19,041)		(9,813)
Cash flows from (used for) investing activities:
Acquisition	(21,907)
Capital expenditures	(25,715)		(10,160)		(6,824)
Proceeds from disposition of property and equipment	126		991		376
Net cash used for investing activities	(47,496)		(9,169)		(6,448)
Cash flows from (used for) financing activities:
Credit facility revolver borrowings	597,867		387,220		307,298
Credit facility revolver repayments	(491,572)		(355,584)		(288,499)
Principal payments under capital lease obligation	(7)
Industrial revenue bond repayments	(930)		(895)		(865)
Credit facility fees and expenses	(171)		(969)		(131)
Proceeds from employee stock options			10		46
Dividends paid	(880)		(878)		(877)
Net cash from financing activities	104,307		28,904		16,972
Cash and cash equivalents:
Net change	6,310		694		711
Beginning balance	3,009		2,315		1,604
Ending balance	9,319		3,009		2,315
Cash paid during the period
Interest paid	10,241		6,433		4,300
Income taxes paid	$ 11,316		$ 9,357		$ 982

[1] Includes a $6.2 million tax benefit related to the U.S. Tax Cuts and Jobs Act.