CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 40,239	$ (12,183)
Less: (loss) gain on sale of discontinued operations	(1,589)	13,713
Less: net income from discontinued operations	0	10,523
Income (loss) from continuing operations	41,828	(36,419)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities of continuing operations:
Depreciation	33,708	33,437
Amortization of intangible assets	46,736	43,982
Amortization of debt issuance costs and debt discount	2,156	7,370
Inventory fair value purchase accounting adjustment	285	1,057
Loss on extinguishment of debt	0	58,475
Provision for doubtful accounts	2,390	1,810
Stock-based compensation	4,187	2,175
Reduction in tax receivable agreement	(242)	(1,189)
Unrealized gain on derivative instruments, net	0	(265)
Loss on disposal of property and equipment	584	552
Right-of-use assets non-cash expense	27,801	0
Deferred income taxes	(1,038)	221
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	20,272	(23,326)
Other receivables	1,151	(1,721)
Inventories	(8,226)	(8,834)
Prepaid expenses and other current assets	1,168	2,708
Other assets	(167)	(1,320)
Accounts payable	2,477	(1,951)
Accrued payroll and employee benefits	2,449	11,105
Accrued taxes	(3,164)	4,893
Operating lease liability	(26,940)
Other liabilities	(1,697)	(16,911)
Net cash provided by operating activities from continuing operations	145,718	75,849
Cash flows from investing activities from continuing operations:
Purchases of property and equipment	(34,402)	(34,892)
Proceeds from termination of net investment hedge	3,313	0
Payment of net working capital adjustments related to acquisitions	0	(40)
Proceeds from net working capital adjustments related to acquisitions	464	154
Proceeds from the disposal of fixed assets	3,441	2,315
Acquisitions, net of cash acquired	(33,751)	(93,477)
Net cash used in investing activities from continuing operations	(60,935)	(125,940)
Cash flows from financing activities from continuing operations:
Proceeds from asset-based revolving credit facility	531,993	897,911
Repayments of asset-based revolving credit facility	(588,993)	(799,272)
Principal payments for term loan	(4,500)	0
Term loan proceeds	0	450,000
Principal payments on long-term debt	0	(575,000)
Prepayment premium on bond	0	(23,872)
Debt issuance costs and deferred finance costs	0	(7,935)
Payment related to tax receivable agreement	(16,667)	0
Tax withholding payment related to net settlement of equity awards	(155)	(61)
Principal repayment of finance lease obligations	(2,674)	(2,771)
Net cash used in financing activities from continuing operations	(80,996)	(61,000)
Net cash used in operating activities from discontinued operations	0	(6,614)
Net cash (used in) provided by investing activities from discontinued operations	(1,589)	121,568
Net cash used in financing activities from discontinued operations	0	(162)
Net cash (used in) provided by discontinued operations	(1,589)	114,792
Effect of exchange rate changes on cash	269	(503)
Net increase in cash	2,467	3,198
Cash and cash equivalents at beginning of period	15,299	12,101
Cash and cash equivalents at end of period	17,766	15,299
Supplemental disclosures of cash flow information:
Cash paid for income taxes	13,190	2,507
Cash paid for interest	31,749	61,199
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivatives, net of tax	5,443	4,616
Goodwill adjustment for purchase price allocation	$ 466	$ 202