CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 30,857	$ (30,434)
Add: loss on sale of discontinued operations	(1,401)	0
Less: net income from discontinued operations	0	7,913
Net income (loss) from continuing operations	32,258	(38,347)
Adjustments to reconcile net income (loss) to net cash provided by operating activities from continuing operations:
Depreciation	26,173	24,383
Amortization of intangible assets	34,738	32,539
Amortization of debt issuance costs and debt discount	1,617	6,834
Loss on extinguishment of debt	0	58,475
Inventory fair value purchase accounting adjustment	234	413
Provision for doubtful accounts	2,017	1,654
Stock-based compensation	3,056	1,512
Unrealized gain on derivative instruments, net	0	(56)
(Gain) loss on disposal of property and equipment	(54)	614
Right-of-use assets non-cash expense	20,586	0
Deferred income taxes	63	(13,038)
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(32,949)	(65,361)
Other receivables	10,520	5,361
Inventories	5,623	(3,244)
Prepaid expenses and other current assets	(4,198)	(496)
Other assets	(187)	(1,928)
Accounts payable	2,417	(8,940)
Accrued payroll and employee benefits	214	7,929
Accrued taxes	(860)	4,783
Operating lease liability	(20,034)	0
Other liabilities	6,019	(13,960)
Net cash provided by (used in) operating activities from continuing operations	87,253	(873)
Cash flows from investing activities from continuing operations:
Purchases of property and equipment	(29,369)	(28,157)
Proceeds from termination of net investment hedge	3,313	0
Proceeds from net working capital adjustments related to acquisitions	461	115
Proceeds from the disposal of fixed assets	2,719	1,605
Acquisitions, net of cash acquired	(21,882)	(70,334)
Net cash used in investing activities from continuing operations	(44,758)	(96,771)
Cash flows from financing activities from continuing operations:
Proceeds from asset-based revolving credit facility	403,454	757,298
Repayments of asset-based revolving credit facility	(415,178)	(498,964)
Principal payments for term loan	3,375	0
Term loan proceeds	0	450,000
Term loan original issuance discount and deferred finance costs	0	(7,935)
Repayment of bond principal	0	(575,000)
Prepayment premium on senior secured notes	0	(23,872)
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	(2,002)	(2,094)
Net cash (used in) provided by financing activities from continuing operations	(33,923)	99,372
Net cash used in operating activities from discontinued operations	0	(2,063)
Net cash used in investing activities from discontinued operations	(1,401)	(928)
Net cash used in financing activities of discontinued operations	0	(140)
Net cash used in discontinued operations	(1,401)	(3,131)
Effect of exchange rate changes on cash	198	(138)
Net increase (decrease) in cash	7,369	(1,541)
Cash and cash equivalents at beginning of period	15,299	12,101
Cash and cash equivalents at end of period	22,668	10,560
Supplemental disclosures of cash flow information:
Cash paid for income taxes	10,401	1,504
Cash paid for interest	24,150	52,288
Supplemental disclosures of non-cash investing and financing activities:
Change in fair value of derivatives, net of tax	5,663	839
Goodwill adjustment for purchase price allocation	$ 57	$ 202