CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash (used in) provided by operating activities:
Net (loss) income	$ (47,612)	$ (47,472)	$ (2,891)	$ 21,477
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Amortization of intangible assets	4,838	5,716	5,287	2,108
Depreciation	4,634	4,582	4,030	2,520
Change in valuation of warrants	4,000	(1,413)	(9,300)	(6,170)
Stock compensation expense	473	1,619	1,501	1,487
Amortization of financing fees	4,117	3,048	443	87
Deferred income taxes	239	18,121	(9,058)	(1,624)
Loss on extinguishment of debt	11,921	357	12	0
Asset impairment charges	1	1,614	11,686	310
Tax benefit from exercise of stock-based compensation	0	(55)	0	0
Change in valuation of contingent consideration	0	(283)	(23)	(3,840)
Provision for doubtful accounts	67	80	288	70
Provision for inventory obsolescence	421	5,341	1,712	1,856
Loss (gain) on disposal of fixed assets	423	(663)	175	321
Other sources, net	13	413	681	612
Changes in operating assets and liabilities:
Trade accounts receivable, net	(8,391)	10,116	10,589	(30,682)
Inventory, net	13,366	55,564	(47,505)	(44,240)
Prepaid expenses and other assets	(2,284)	(12,893)	2,126	(3,224)
Trade accounts payable	(1,198)	(27,037)	5,913	37,647
Income taxes refundable (payable)	6,508	(1,783)	(7,673)	1,327
Accrued expenses	6,029	15,709	1,085	5,096
Other noncurrent liabilities	(5,260)	1,601	8,107	(232)
Net cash (used in) provided by operating activities	(7,695)	32,282	(22,815)	(15,094)
Cash flows from investing activities:
Capital expenditures	(5,061)	(3,872)	(8,409)	(8,214)
Proceeds from disposal of assets	0	2,466	0	0
Acquisitions of businesses, net of cash acquired	0	0	(34,227)	(44,122)
Other (uses) sources, net	(104)	(245)	(1,169)	14
Net cash used in investing activities	(5,165)	(1,651)	(43,805)	(52,322)
Cash flows from financing activities
Proceeds from issuance of long-term debt	0	60,000	55,000	5,000
Repayments of long-term debt	(71,400)		(4,028)	(972)
Financing fees	(928)	(5,802)	(1,517)	(154)
Net proceeds from stock offering and warrants	59,396	2,001	65	1,425
Proceeds from revolving line of credit	436,228	281,007	93,629	82,401
Repayments of revolving line of credit	(411,948)	(365,532)	(74,359)	(22,305)
Business acquisition contingent consideration payments	(26)	(8,348)	0	0
Tax benefit from exercise of stock-based compensation			65	2,706
Other uses, net	(754)	(110)	(351)	(430)
Net cash provided by (used in) financing activities	10,568	(36,784)	68,504	67,671
(Decrease) increase in cash	(2,292)	(6,153)	1,884	255
Cash at beginning of the year	2,292	8,445	6,561	6,306
Cash at end of the year	$ 0	$ 2,292	$ 8,445	$ 6,561