Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Activities
Net loss	$ 1,752	$ (3,362)	$ (29,417)	$ (8,720)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			21,279	22,056
Impairment of goodwill			22,708
Loss /(profit) on sale of property, plant and equipment			181	(223)
Provision for doubtful accounts			2,089	1,238
Warrant contra revenue	410	(0)	1,173	730
Share-based compensation expense			447	1,151
Deferred income taxes			1,192	209
Share of loss / (profit) of equity accounted investees	5	16	25	(988)
Changes in operating assets and liabilities:
Trade accounts receivable, net			26,171	(1,529)
Prepaid expenses and other assets, current and noncurrent			(117)	(950)
Trade accounts payable			(10,155)	(5,236)
Income taxes, net			1,300	(2,267)
Accrued expenses and other liabilities, current and noncurrent			27,421	1,150
Net cash generated from operating activities			64,297	6,621
Investing Activities
Purchases of property, plant and equipment			(10,141)	(9,027)
Proceeds from equity-accounted investees			429	1,317
Net cash used in investing activities			(9,712)	(7,710)
Financing Activities
Proceeds from the issuance of common stock			8,379	6,563
Payments on long term debt			(4,200)	(7,000)
Proceeds from (payments on) other debt, net			(34,549)	5,831
Net cash (used in) / generated from financing activities			(30,370)	5,394
Net increase in cash and cash equivalents			24,215	4,305
Effect of exchange rate changes on cash and cash equivalents and restricted cash			(256)	(497)
Cash and cash equivalents and restricted cash at the beginning of the period			32,626	24,569	$ 24,569
Cash and cash equivalents and restricted cash at the end of the period	56,585	28,377	56,585	28,377	32,626
Components of cash and cash equivalents and restricted cash
Balances with banks	48,463	17,795	48,463	17,795	$ 20,464
Restricted cash	8,122	10,582	8,122	10,582
Total cash and cash equivalents and restricted cash	$ 56,585	$ 28,377	56,585	28,377
Supplemental disclosure of Cash Flow Information
Cash paid for Interest and other finance cost			10,392	11,179
Cash paid for income taxes			2,752	6,740
Non cash warrant contra revenue			1,173	730
Non cash share-based compensation expenses			$ 447	$ 1,151