CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income		$ 14,376	$ 3,482
Add: loss on sale of discontinued operations		0	(1,346)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent, Total		14,376	4,828
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation		7,249	8,846
Amortization of intangible assets		11,970	11,496
Amortization of debt issuance costs and debt discount		540	539
Inventory fair value purchase accounting adjustment		0	196
Provision for expected credit losses		652	636
Stock-based compensation		1,393	829
Loss on disposal of property and equipment		51	191
Right-of-use assets non-cash expense		7,489	6,743
Deferred income taxes		3,133	211
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable		(30,308)	(23,860)
Other receivables		16,875	16,851
Inventories		5,924	(2,917)
Prepaid expenses and other current assets		460	(2,206)
Other assets		(24)	(15)
Accounts payable		6,256	9,182
Accrued payroll and employee benefits		(7,349)	(7,601)
Accrued taxes		863	(831)
Operating lease liabilities		(7,335)	(6,618)
Other liabilities		(4,499)	1,209
Net cash provided by operating activities from continuing operations		27,716	17,709
Cash flows from investing activities from continuing operations:
Purchases of property and equipment		(11,442)	(5,242)
Payments of net working capital adjustments related to acquisitions		34	13
Proceeds from the disposal of fixed assets		474	238
Acquisitions, net of cash acquired		(8,638)	(10,757)
Net cash used in investing activities from continuing operations		(19,640)	(15,774)
Cash flows from financing activities from continuing operations:
Proceeds from asset-based revolving credit facility		322,500	145,276
Payments of Asset-Based Credit Facility		(176,500)	(137,776)
Repayments of Long-term Debt		(1,125)	(1,125)
Payment related to tax receivable agreement	$ (16,700)	(27,850)	(16,667)	$ (27,900)
Tax withholding payment related to net settlement of equity awards		(362)	(130)
Principal repayment of finance lease obligations		(678)	(654)
Net cash provided by (used in) financing activities from continuing operations		115,985	(11,076)
Net cash used in investing activities from discontinued operations		0	(1,346)
Net cash used in discontinued operations		0	(1,346)
Effect of exchange rate changes on cash		(592)	166
Net increase (decrease) in cash		123,469	(10,321)
Cash and cash equivalents at beginning of period	$ 15,299	17,766	15,299	15,299
Cash and cash equivalents at end of period		141,235	4,978	$ 17,766
Supplemental disclosures of cash flow information:
Cash paid for income taxes		103	79
Cash paid for interest		7,665	8,613
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivatives, net of tax		499	3,496
Goodwill adjustment for purchase price allocation		$ 55	$ 187