Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 8,006	$ 2,640	$ (396)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	20,346	15,804	15,596
Loss on disposal of assets	472	404	253
Loss on debt extinguishment	1,018	0	0
Loss on sale of business	0	0	1,058
Amortization of intangible assets	9,925	5,928	6,995
Amortization of debt issue costs	390	542	440
Non-cash stock based compensation	10,000	6,955	6,441
Non-cash operating lease expense	5,635
Changes in assets and liabilities, net:
Accounts receivable, net	(17,301)	209	(5,594)
Inventories	(5,754)	734	(1,423)
Prepaid assets	(234)	(482)	(372)
Other assets	(133)	(1,352)	(475)
Accounts payable, accrued and other liabilities	(9,001)	13,404	(4,486)
Net cash provided by operating activities	23,369	44,786	18,037
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(20,029)	(14,310)	(13,690)
Acquisition, net of cash acquired	399	(125,377)	0
Net cash used in investing activities	(19,630)	(139,687)	(13,690)
CASH FLOWS FROM FINANCING ACTIVITIES
Advances on revolving credit facility	0	15,000	2,496
Repayment of revolving credit facility	(5,000)	(35,400)	0
Redemption of preferred stock	0	(50,096)	0
Repayment of equipment and other loans	(7,201)	(6,563)	(5,424)
Proceeds from term loan	100,000	30,000	0
Repayment of term loan	(99,250)	(4,500)	(3,753)
Payments of debt issue costs	(1,059)	(576)	0
Issuance of common stock, net	11,202	9,023	2,586
Proceeds from equity offering, net	160,774	135,071	0
Net cash provided by (used in) financing activities	159,466	91,959	(4,095)
Effects of foreign exchange rate changes on cash and cash equivalents	0	(68)	44
Net change in cash and cash equivalents	163,205	(3,010)	296
Cash and cash equivalent, beginning of year	9,811	12,821	12,525
Cash and cash equivalents, end of year	173,016	9,811	12,821
Supplemental disclosure of cash flow information:
Interest paid	4,775	6,511	5,155
Income taxes paid (refunded), net	319	(31)	284
Supplemental disclosure of non-cash investing and financing information:
Fair value of common stock issued to fund acquisition	0	13,243	0
Fair value of common stock issued to fund purchase of customer list	0	0	4,095
Working capital adjustment related to acquisition	1,977	0	0
Equipment acquired under financing obligations	4,283	7,569	5,728
Property and equipment included in accounts payable	$ 1,034	$ 660	$ 495