CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net (loss) income	$ (61,510)	$ (30,240)	$ 23,562
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization	83,456	47,593	44,356
Provision for bad debts	63	1,208	308
Stock based compensation for equity classified awards	2,934	2,804	1,886
Pension expense (income)	0	17	(153)
Amortization of deferred financing cost	2,600	2,476	2,368
Cash received on interest rate swap termination, net of non-cash interest income recognized	0	3,684	0
Accretion of contingent consideration	3,459	3,781	8,433
Change in fair value of contingent consideration	(330)	(3,018)	(26,948)
Deferred income taxes	(21,631)	1,154	(12,515)
Impairment of assets	11,424	2,600	0
Loss (gain) on sales of property	4	(52)	81
Other	0	0	98
Changes in operating assets and liabilities:
Accounts receivable	(321)	(5,362)	5,981
Inventories	(388)	(1,581)	(2,496)
Prepaid expenses and other current assets	2,087	(652)	(5,176)
Accounts payable	6,499	(10,955)	(13,889)
Accrued expenses and other liabilities	(9,239)	(4,175)	18,432
Income taxes payable	1,615	(4,053)	2,844
Other assets and liabilities	(663)	(2,217)	(11,783)
Net cash provided by operating activities	20,059	3,012	35,389
Cash flows from investing activities:
Cash paid for property and equipment	(4,176)	(4,164)	(7,725)
Proceeds from sale of property	0	0	99
Acquisition of business, net of cash acquired	0	0	(18,192)
Other investments	(250)	(1,587)	(11,132)
Net cash used in investing activities	(4,426)	(5,751)	(36,950)
Cash flows from financing activities:
Payment of Dow liabilities settlement	0	(10,000)	(10,000)
Repayment of long term debt	(6,285)	(6,096)	(4,015)
Payments of contingent consideration	0	(6,132)	0
Borrowings under revolving credit facility	4,000	11,000	0
Repayments of revolving credit facility	(4,000)	(11,000)	0
Settlement payment under Tax Receivables Agreement	(16,003)	0	0
Proceeds from issuance of stock under employee stock purchase plan	241	0	0
Net cash used in financing activities	(22,047)	(22,228)	(14,015)
Effect of exchange rate changes on cash and cash equivalents	1,379	(4,714)	2,797
Net decrease in cash and cash equivalents	(5,035)	(29,681)	(12,779)
Cash and cash equivalents, beginning of period	34,852	64,533	77,312
Cash and cash equivalents, end of period	29,817	34,852	64,533
Cash paid for:
Interest	30,144	34,712	18,884
Income taxes	2,642	6,949	3,257
Supplemental schedule of non-cash investing and financing activities:
Accrued purchases of property and equipment	71	607	1,422
Acquisition-related contingent consideration	0	0	691
Settlement of Dow liabilities not resulting from a cash payment	22,012	0	55,089
Reconciliation of cash and cash equivalents and restricted cash:
Total cash and cash equivalents and restricted cash	$ 34,852	$ 34,852	$ 77,312