Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 4,889	$ 1,902
Restricted cash	15,513	8,083
Trade accounts receivable, net of allowance of $1,805 and $3,053, respectively	53,846	60,351
Inventories	8,546	8,716
Assets held for sale	7,344	4,383
Prepaid expenses and other current assets	11,925	12,010
Total current assets	102,063	95,445
Property and equipment, net of accumulated depreciation of $179,801 and $172,296, respectively	197,766	210,563
Operating lease right-of-use assets	8,896	9,614
Intangible assets, net of accumulated amortization of $1,222 and $1,099, respectively	6,055	6,178
Other assets, net	16,319	27,273
Total assets	331,099	349,073
Current liabilities:
Accounts payable	68,463	64,944
Accrued expenses	67,327	55,264
Current portion of insurance reserves	24,181	22,587
Current portion of finance lease liabilities	6,839	7,520
Current portion of operating lease liabilities	1,800	1,936
Other current liabilities	2,058	8,371
Total current liabilities	170,668	160,622
Long-term debt, net	327,572	317,763
Insurance reserves	19,478	19,636
Asset retirement obligations	10,157	9,697
Operating lease liabilities	8,195	8,488
Other long-term liabilities	12,881	13,499
Total liabilities	548,951	529,705
Series A Participating Preferred Stock; $0.01 par value; 5,000,000 authorized and 118,805 outstanding	22,000	22,000
Stockholders' deficit:
Common stock; $0.01 par value; 198,805,000 shares authorized; 27,912,059 shares issued and 24,899,932 shares outstanding	279	279
Additional paid-in capital	493,819	493,767
Retained deficit	(728,616)	(691,344)
Treasury stock, at cost, 3,012,127 shares	(5,334)	(5,334)
Total stockholders' deficit	(239,852)	(202,632)
Total liabilities and stockholders' deficit	$ 331,099	$ 349,073