Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss		$ (186,019,000)	$ (237,203,000)	$ (32,417,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization		41,518,000	45,908,000	49,059,000
Loss on debt extinguishment and modification		415,000	2,224,000	279,000
Loss on warrants		59,000	0	0
Amortization of debt issuance costs and debt discounts		13,784,000	8,829,000	7,695,000
Allowance for credit losses		1,943,000	1,612,000	(2,573,000)
Foreign currency loss		5,674,000	2,758,000	494,000
Deferred income taxes		4,521,000	(3,974,000)	3,795,000
(Gain) loss on asset disposal		(2,981,000)	1,161,000	(187,000)
Goodwill impairment charges		64,632,000	191,788,000	0
Non-cash compensation cost		7,013,000	6,307,000	10,055,000
Other, net		(4,844,000)	(3,994,000)	(2,409,000)
Changes in operating assets and liabilities:
Accounts receivable		700,000	46,147,000	27,194,000
Inventory		528,000	2,702,000	9,551,000
Prepaid expenses and other current assets		4,190,000	(210,000)	494,000
Accounts payable		1,178,000	3,782,000	(5,356,000)
Other accrued liabilities		11,631,000	(12,798,000)	(8,378,000)
Income taxes		605,000	(2,275,000)	1,540,000
Net cash (used in) provided by operating activities		(35,453,000)	52,764,000	58,836,000
Cash flows from investing activities:
Capital expenditures	[1]	(17,605,000)	(19,958,000)	(29,035,000)
Business acquisitions, net of cash acquired		0	(1,013,000)	0
Proceeds from disposal of assets		3,528,000	2,645,000	934,000
Other		0	25,000	0
Net cash used in investing activities		(14,077,000)	(18,301,000)	(28,101,000)
Cash flows from financing activities:
Net payments under Credit Facility revolver		0	(76,638,000)	(82,396,000)
Borrowings under ABL Facility, net		62,000,000	0	0
Borrowings under ABL Facility, gross		128,000,000	44,000,000	0
Payments under ABL Facility, gross		(137,000,000)	(35,000,000)	0
Net borrowings under Subordinated Term Loan		50,000,000	0	0
Borrowings (payments) under Credit Facility term loan, net of debt discount		0	(50,000,000)	49,745,000
Borrowings under Term Loan, net of discount		0	242,500,000	0
Repurchase of convertible debt		0	(135,501,000)	0
Contingent consideration payments		0	0	(428,000)
Payments for debt issuance costs		(10,457,000)	(9,113,000)	(1,524,000)
Taxes paid related to net share settlement of share-based awards		(240,000)	(990,000)	(1,911,000)
Payments for debt extinguishment and equity reacquisition costs		0	(2,447,000)	0
Other		(453,000)	(272,000)	(291,000)
Net cash provided by (used in) financing activities		91,850,000	(23,461,000)	(36,805,000)
Effect of exchange rate changes on cash		(1,591,000)	1,409,000	(43,000)
Net increase (decrease) in cash and cash equivalents		40,729,000	12,411,000	(6,113,000)
Cash and cash equivalents at beginning of period		24,586,000	12,175,000	18,288,000
Cash and cash equivalents at end of period		65,315,000	24,586,000	12,175,000
Cash paid (refunded) during the year for:
Interest		28,176,000	23,623,000	22,697,000
Income taxes		$ 5,829,000	$ (9,996,000)	$ (3,536,000)

[1] Excludes accrued capital expenditures for the years ended December 31, 2021, 2020 and 2019.