Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (27,647)	$ 8,030
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	26,057	19,881
Equity based compensation expense	10,795	1,984
Loss (gain) on sale of property and equipment	39	(170)
Write-off of deferred financing costs related to debt extinguishment	1,712	40
Amortization of deferred financing costs	2,508	360
Provision for bad debts	607	1,017
Changes in assets & liabilities:
Decrease in accounts receivable and unbilled receivable	3,519	6,567
(Increase) decrease in prepaid expenses	(45)	1,180
(Increase) in other current assets	(3,745)	(359)
(Decrease) increase in trade accounts payable	(4,603)	6,233
Increase (decrease) in accrued liabilities	5,127	(3,961)
(Decrease) in other current and long-term liabilities	2,370	(8,450)
(Increase) in other long-term assets	(1,211)	(845)
Net cash provided by operating activities	15,483	31,507
Cash flows from investing activities:
Purchases of property and equipment	(3,498)	(8,453)
Proceeds from disposal of property and equipment	318	1,140
Purchase of engineering license		(2,000)
Purchase of business, net of cash acquired	(20,387)	(294)
Net cash used in investing activities	(23,567)	(9,607)
Cash flows from financing activities:
Proceeds from issuance of debt	339,000	181,687
Payment of loan acquisition costs	(17,949)	(1,274)
Repayments of debt	(215,683)	(129,209)
Proceeds from issuance of redeemable preferred stock	141,840
Payments of redeemable preferred stock dividends	(6,611)
Issuance of common stock	10,229
Member distributions	(21,830)	(54,365)
Distributions to non-controlling interests	(717)
Payment to shareholders associated with Atlas Business Combination	(226,318)
Payment of contingent earn-out		(5,063)
Net cash provided by (used in) financing activities	1,961	(8,224)
Net change in cash and equivalents	(6,123)	13,676
Cash and equivalents - beginning of period	20,185	6,509
Cash and equivalents - end of period	14,062	20,185
Supplemental information:
Interest	20,453	10,284
Taxes	745	2,169
Capital assets financed	165	276
Contingent consideration share settled	$ 1,060