Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (14,192)	$ (35,997)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation expense	11,295	14,125
Amortization of debt financing costs	410	410
Share-based compensation expense	26	306
Deferred income tax expense (benefit)	365	(150)
Loss (gain) on disposal of assets	(1,893)	(2,733)
Changes in operating assets and liabilities:
Trade receivables, net	(13,205)	(430)
Materials and Supplies	(482)	9
Prepaid expenses and other current assets	155	(1,766)
Other assets	(16,639)	(2,069)
Accounts payable	23,165	(878)
Other current liabilities and other long-term liabilities	2,790	13,822
Net cash used in operating activities	(8,205)	(15,351)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property and equipment	(6,899)	(456)
Net proceeds from sale of assets	3,100	0
Net proceeds from sale of Titanium Explorer		13,557
Net cash (used in) provided by investing activities	(3,799)	13,101
CASH FLOWS FROM FINANCING ACTIVITIES
Net cash provided by financing activities
Net decrease in unrestricted and restricted cash and cash equivalents	(12,004)	(2,250)
Unrestricted and restricted cash and cash equivalents—beginning of period	90,608	154,487
Unrestricted and restricted cash and cash equivalents—end of period	78,604	152,237
Cash paid for:
Interest		9
Income taxes (net of refunds)	1,769	785
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accrued additions to property and equipment	$ 8,097	$ 0