Condensed Consolidated Statement of Cash Flows - 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	Dec. 31, 2018
Cash flows from operating activities
Net loss			$ (89,677)	$ (205,032)
Adjustments to reconcile net loss
Depreciation and amortization	$ 22,095	$ 25,079	68,127	76,482
Original issue discount and debt issuance cost amortization			10,979	8,730
Impairment of goodwill and other intangible assets		97,158		97,158	$ 349,600	$ 48,100
Debt modification and extinguishment costs				1,049
Provision for doubtful accounts			415	4,402
Deferred income tax provision			(417)	1,632
Share-based compensation expense			2,480	6,903
Foreign currency remeasurement			(499)	(173)
Loss (gain) on sale of assets			(44,868)	123
Fair value adjustment for interest rate swap			23	4,965
Change in operating assets and liabilities, net effect from acquisitions:
Accounts receivable			44,197	3,501
Prepaid expenses and other assets			(8,012)	2,377
Accounts payable and accrued liabilities			(48,257)	(41,146)
Related party balances			(362)	(5,198)
Additions to outsource contract costs			(289)	(3,130)
Net cash used in operating activities			(66,160)	(47,357)	(63,900)	23,600
Cash flows from investing activities
Purchases of property, plant, and equipment			(6,893)	(10,797)
Additions to internally developed software			(2,988)	(5,074)
Cash paid in acquisition, net of cash received			(12,500)	(5,000)
Proceeds from sale of assets			50,126	360
Net cash provided by (used in) investing activities			27,745	(20,511)
Cash flows from financing activities
Repurchases of Common Stock				(3,480)
Borrowings from other loans			28,626	21,530
Borrowings under factoring arrangement and A/R Facility			166,786	48,748
Principal repayment on borrowings under factoring arrangement and A/R Facility			(84,121)	(49,243)
Cash paid for withholding taxes on vested RSUs				(223)
Proceeds from senior secured term loans				29,850
Lease terminations			(331)	(314)
Cash paid for debt issuance costs			(12,708)	(7)
Borrowings from senior secured revolving facility			29,750	130,500
Repayments on senior secured revolving facility			(14,200)	(91,500)
Principal payments on finance lease obligations			(9,614)	(13,598)
Principal repayments on senior secured term loans and other loans			(37,283)	(32,996)
Net cash provided by financing activities			66,905	39,267
Effect of exchange rates on cash			619	(29)
Net increase (decrease) in cash and cash equivalents			29,109	(28,630)
Cash, restricted cash, and cash equivalents
Beginning of period			14,099	43,854	43,854
End of period	$ 43,208	$ 15,224	43,208	15,224	$ 14,099	$ 43,854
Supplemental cash flow data:
Income tax payments, net of refunds received			2,767	6,981
Interest paid			140,751	131,744
Noncash investing and financing activities:
Assets acquired through right-of-use arrangements			2,472	9,352
Settlement gain on related party payable to Ex-Sigma 2			1,287
Accrued capital expenditures			$ 1,699	$ 2,388