Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Operating Activities
Net income/ (loss)	$ 3,122	$ 1,752	$ 1,387	$ (29,417)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			20,398	21,279
Impairment of goodwill	0		0	22,708	$ 35,944
Profit on sale of property, plant and equipment			(37)	181
Provision for doubtful accounts			23	2,089
Amortisation of debt issuance cost			2,980	1,148
Amortisation of call option premium			360	0
Warrant contra revenue	161	410	991	1,173
Share-based compensation expense			932	447
Deferred income taxes			1,838	1,192
Share of loss of equity-accounted investees	46	5	1	25
Changes in operating assets and liabilities:
Trade accounts receivables			13,120	26,171
Prepaid expenses and other assets			(11,968)	(117)
Trade accounts payables			(13,409)	(10,155)
Income taxes, net			(602)	1,300
Accrued expenses and other liabilities			6,543	27,421
Net cash generated from operating activities			22,557	65,445
Investing Activities
Purchase of property, plant and equipment			(13,358)	(10,141)
Investment in equity-accounted investees			(25,000)	0
Payments for call option premium			(3,000)	0
Proceeds from equity-accounted investees			102	429
Net cash used in investing activities			(41,256)	(9,712)
Financing Activities
Proceeds from the issuance of common stock			1,434	8,379
Proceeds from long term debt			165,000	0
Payments on long term debt			(117,600)	(4,200)
Payments for loan fees related to long term debt			(2,794)	0
Payments on other debt, net			(13,145)	(35,697)
Common stock repurchase			(329)	0
Net cash generated from/ (used in) financing activities			32,566	(31,518)
Net increase in cash and cash equivalents			13,867	24,215
Effect of exchange rate changes on cash and cash equivalents and restricted cash			(952)	(256)
Cash and cash equivalents and restricted cash at beginning of period			50,559	32,626	32,626
Cash and cash equivalents and restricted cash at end of period	63,474	56,585	63,474	56,585	50,559
Components of cash and cash equivalents and restricted cash
Balance with banks	56,840	48,463	56,840	48,463	$ 44,507
Restricted cash	6,634	8,122	6,634	8,122
Total cash and cash equivalents and restricted cash	$ 63,474	$ 56,585	63,474	56,585
Supplemental disclosure of cash flow information
Cash paid for interest and other finance costs			19,985	10,392
Cash paid for income taxes			7,884	2,752
Non-cash warrant contra revenue			991	1,173
Non-cash share-based compensation expenses			$ 932	$ 447