CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (52,966)	$ (54,153)	$ (30,240)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	46,970	83,456	47,593
Provision for bad debts	(237)	63	1,208
Stock based compensation for equity classified awards	3,440	2,934	2,804
Pension expense	0	0	17
Amortization of deferred financing cost	2,875	2,600	2,476
Cash received on interest rate swap termination, net of non-cash interest income recognized	(2,258)	0	3,684
Accretion of contingent consideration	0	3,459	3,781
Change in fair value of contingent consideration	0	(330)	(3,018)
Deferred income taxes	29,251	(28,988)	1,154
Impairment of assets	0	11,424	2,600
Loss (gain) on sales of property	162	4	(52)
Changes in operating assets and liabilities:
Accounts receivable	4,989	(321)	(5,362)
Inventories	(1,745)	(388)	(1,581)
Prepaid expenses and other current assets	(6,173)	2,087	(652)
Accounts payable	4,168	6,499	(10,955)
Accrued expenses and other liabilities	878	(9,239)	(4,175)
Income taxes payable	(1,242)	1,615	(4,053)
Other assets and liabilities	(1,397)	(663)	(2,217)
Net cash provided by operating activities	26,715	20,059	3,012
Cash flows from investing activities:
Cash paid for property and equipment	(2,395)	(4,176)	(4,164)
Other investments	0	(250)	(1,587)
Net cash used in investing activities	(2,395)	(4,426)	(5,751)
Cash flows from financing activities:
Net proceeds from issuance of convertible preferred stock	145,490	0	0
Payment of issuance costs for convertible preferred stock	(7,006)	0	0
Payment of dividends	(5,244)	0	0
Proceeds from long term debt	2,042	0	0
Payment of deferred financing costs	(8,034)	0	0
Payment of Dow liabilities settlement	0	0	(10,000)
Repayment of long term debt	(132,423)	(6,285)	(6,096)
Payments of contingent consideration	0	0	(6,132)
Borrowings under revolving credit facility	0	4,000	11,000
Repayments of revolving credit facility	0	(4,000)	(11,000)
Settlement payment under Tax Receivables Agreement	0	(16,003)	0
Proceeds from issuance of stock under employee stock purchase plan	316	241	0
Net cash used in financing activities	(4,859)	(22,047)	(22,228)
Effect of exchange rate changes on cash and cash equivalents	752	1,379	(4,714)
Net increase (decrease) in cash and cash equivalents	20,213	(5,035)	(29,681)
Cash and cash equivalents, beginning of period	29,817	34,852	64,533
Cash and cash equivalents, end of period	50,030	29,817	34,852
Cash paid for:
Interest	23,792	30,144	34,712
Income taxes	2,722	2,642	6,949
Supplemental schedule of non-cash investing and financing activities:
Accrued purchases of property and equipment	141	71	607
Settlement of Dow liabilities not resulting from a cash payment	0	22,012	0
Reconciliation of cash and cash equivalents and restricted cash:
Total cash and cash equivalents and restricted cash	$ 29,817	$ 29,817	$ 34,852