Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash	$ 30,359	$ 4,913
Restricted cash	14,268	1,215
Trade accounts receivable, net	56,790	50,570
Receivable from affiliates	72	390
Contract assets	19,733	20,641
Inventory	9,736	14,792
Income tax receivable	595	1,374
Prepaid expenses and other current assets	4,884	4,615
Total current assets	136,437	98,510
Property and equipment, net	75,155	85,294
Goodwill	74,213	74,213
Intangible assets, net	88,321	92,473
Equity method investments	4,851	5,078
Other assets	1,192	188
Total assets	380,169	355,756
Current liabilities:
Accounts payable	17,433	25,510
Contract liabilities	14,955	582
Notes payable, current maturities	38,721	34,873
Asset retirement obligation, current portion	5,845	9,944
Purchase option liability	7,110	7,110
Accrued liabilities	37,496	35,490
Other current liabilities	1,086	1,116
Total current liabilities	122,646	114,625
Long-term liabilities:
Deferred tax liabilities	1,492	1,492
Contingent payments for acquisitions	11,586	11,481
Asset retirement obligation	5,103	5,187
Line of credit	24,500	19,000
Notes payable, less current maturities	153,831	150,698
Other liabilities	1,000	0
Total liabilities	320,158	302,483
Commitments and contingencies (see Note 15)
Mezzanine equity
Series A Preferred Stock — $0.01 par value; 50,000 shares authorized, 26 shares issued and outstanding as of June 30, 2020; aggregate liquidation preference of $27,000 as of June 30, 2020	24,549	0
Stockholders’ equity
Retained losses	(50,788)	(33,002)
Common Stock — $0.01 par value; 200,000 shares authorized, 29,986 and 29,624 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	300	296
Additional paid-in capital	85,380	85,187
Total stockholders’ equity	34,892	52,481
Non-controlling interest	570	792
Total equity	35,462	53,273
Total liabilities, mezzanine equity and stockholders’ equity	$ 380,169	$ 355,756