CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 254,530	$ 501,149
Short-term investments	20,059	35,020
Assets held for sale	75,678	146,467
Accounts receivable, net	784,671	1,517,503
Inventory	153,824	230,067
Deferred income taxes		118,230
Other current assets	187,135	193,438
Total current assets	1,475,897	2,741,874
Property, plant and equipment, net	7,027,802	8,599,125
Goodwill	166,659	173,928
Investment in unconsolidated affiliates	415,177	58,251
Other long-term assets	452,305	289,745
Total assets	9,537,840	11,862,923
Current liabilities:
Current portion of debt	6,508	6,190
Trade accounts payable	271,984	780,060
Accrued liabilities	686,613	728,004
Income taxes payable	41,394	53,221
Total current liabilities	1,006,499	1,567,475
Long-term debt	3,655,200	4,331,840
Other long-term liabilities	552,947	601,816
Deferred income taxes	29,326	443,003
Total liabilities	$ 5,243,972	$ 6,944,134
Commitments and contingencies (Note 17)
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 330,526 and 328,196, respectively	$ 331	$ 328
Capital in excess of par value	2,493,100	2,452,261
Accumulated other comprehensive income (loss)	(47,593)	77,522
Retained earnings	3,131,134	3,573,172
Less: treasury shares, at cost, 49,342 and 38,788 common shares, respectively	(1,294,262)	(1,194,664)
Total shareholders' equity	4,282,710	4,908,619
Noncontrolling interest	11,158	10,170
Total equity	4,293,868	4,918,789
Total liabilities and equity	$ 9,537,840	$ 11,862,923