CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 417,544	$ 472,246
Short-term investments	17	9,500
Accounts receivable, net of allowance of $67,467 and $69,807, respectively	331,453	362,977
Inventory, net	154,272	160,585
Assets held for sale	16,563	16,562
Other current assets	116,182	109,595
Total current assets	1,036,031	1,131,465
Property, plant and equipment, net	3,829,222	3,985,707
Deferred income taxes	248,863	247,171
Other long-term assets	140,790	139,085
Total assets	5,254,906	5,503,428
Current liabilities:
Trade accounts payable	234,944	220,922
Accrued liabilities	222,361	276,085
Income taxes payable	26,233	10,157
Current lease liabilities	7,259	8,305
Total current liabilities	490,797	515,469
Long-term debt	2,898,879	2,968,701
Other long-term liabilities	338,607	318,034
Deferred income taxes	2,502	1,576
Total liabilities	3,730,785	3,803,780
Commitments and contingencies (Note 8)
Redeemable noncontrolling interest in subsidiary (Note 3)	396,167	442,840
Shareholders' equity:
Preferred shares, par value $0.001 per share: Series A 6% Cumulative Mandatory Convertible; $50 per share liquidation preference; outstanding 4,870 and 4,870, respectively	5	5
Common shares, par value $0.05 per share: Authorized common shares 32,000; issued 8,503 and 8,383, respectively	417	419
Capital in excess of par value	3,429,089	3,423,935
Accumulated other comprehensive income (loss)	(10,756)	(11,124)
Retained earnings (accumulated deficit)	(1,089,251)	(946,100)
Less: treasury shares, at cost, 1,090 and 1,090 common shares, respectively	(1,315,751)	(1,315,751)
Total shareholders' equity	1,013,753	1,151,384
Noncontrolling interest	114,201	105,424
Total equity	1,127,954	1,256,808
Total liabilities and equity	$ 5,254,906	$ 5,503,428