CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 399,881	$ 472,246
Short-term investments	16	9,500
Accounts receivable, net of allowance of $70,047 and $69,807, respectively	312,136	362,977
Inventory, net	147,362	160,585
Assets held for sale	111,682	16,562
Other current assets	116,062	109,595
Total current assets	1,087,139	1,131,465
Property, plant and equipment, net	3,562,350	3,985,707
Deferred income taxes	251,108	247,171
Other long-term assets	141,721	139,085
Total assets	5,042,318	5,503,428
Current liabilities:
Trade accounts payable	232,543	220,922
Accrued liabilities	270,890	276,085
Income taxes payable	19,070	10,157
Current lease liabilities	6,613	8,305
Total current liabilities	529,116	515,469
Long-term debt	2,823,125	2,968,701
Other long-term liabilities	352,348	318,034
Deferred income taxes	2,289	1,576
Total liabilities	3,706,878	3,803,780
Commitments and contingencies (Note 8)
Redeemable noncontrolling interest in subsidiary (Note 3)	398,497	442,840
Shareholders' equity:
Preferred shares, par value $0.001 per share: Series A 6% Cumulative Mandatory Convertible; $50 per share liquidation preference; outstanding 0 and 4,870, respectively		5
Common shares, par value $0.05 per share: Authorized common shares 32,000; issued 9,181 and 8,383, respectively	459	419
Capital in excess of par value	3,433,144	3,423,935
Accumulated other comprehensive income (loss)	(8,624)	(11,124)
Retained earnings (accumulated deficit)	(1,290,309)	(946,100)
Less: treasury shares, at cost, 1,090 and 1,090 common shares, respectively	(1,315,751)	(1,315,751)
Total shareholders' equity	818,919	1,151,384
Noncontrolling interest	118,024	105,424
Total equity	936,943	1,256,808
Total liabilities and equity	$ 5,042,318	$ 5,503,428