Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ 48,331	$ 34,139	$ (64,980)
Adjustments to reconcile net (loss) income to net cash used in operating activities
Depreciation expense	11,087	22,382	28,286
Amortization of debt financing costs		820	819
Share-based compensation expense		44	337
Deferred income tax expense		410	236
Gain on disposal of assets	300	(1,630)	(2,715)
Gain on EDC sale	(60,781)	(60,781)
Changes in operating assets and liabilities:
Trade receivables, net		(58,864)	(6,888)
Materials and Supplies		(1,811)	(1,481)
Prepaid expenses and other current assets		3,369	(1,440)
Other assets		(25,043)	(1,821)
Accounts payable		29,564	2,798
Other current liabilities and other long-term liabilities		17,696	5,905
Net cash used in operating activities		(39,705)	(40,944)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property and equipment		(7,736)	(2,711)
Net proceeds from EDC sale		200,000
Net proceeds from sale of assets		3,100	0
Net proceeds from sale of Titanium Explorer			13,557
Net cash provided by investing activities		195,364	10,846
CASH FLOWS FROM FINANCING ACTIVITIES
Net cash provided by financing activities
Net increase (decrease) in unrestricted and restricted cash and cash equivalents		155,659	(30,098)
Unrestricted and restricted cash and cash equivalents—beginning of period		90,608	154,487
Unrestricted and restricted cash and cash equivalents—end of period	$ 246,267	246,267	124,389
Cash paid for:
Interest		16,229	16,197
Income taxes (net of refunds)		686	2,431
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accrued additions to property and equipment		$ 8,908	$ 0