CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 177,043	$ 254,530
Short-term investments	23,607	20,059
Assets held for sale	69,436	75,678
Accounts receivable, net	503,966	784,671
Inventory	141,934	153,824
Other current assets	156,094	187,135
Total current assets	1,072,080	1,475,897
Property, plant and equipment, net	6,616,711	7,027,802
Goodwill	167,131	166,659
Investment in unconsolidated affiliates	889	415,177
Other long-term assets	567,693	452,305
Total assets	8,424,504	9,537,840
Current liabilities:
Current portion of debt	120	6,508
Trade accounts payable	215,627	271,984
Accrued liabilities	548,337	686,613
Income taxes payable	23,778	41,394
Total current liabilities	787,862	1,006,499
Long-term debt	3,475,978	3,655,200
Other long-term liabilities	551,004	552,947
Deferred income taxes	10,966	29,326
Total liabilities	4,825,810	5,243,972
Commitments and contingencies (Note 7)
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 333,007 and 330,526, respectively	333	331
Capital in excess of par value	2,513,417	2,493,100
Accumulated other comprehensive income (loss)	(11,925)	(47,593)
Retained earnings	2,386,053	3,131,134
Less: treasury shares, at cost, 49,673 and 49,342 common shares, respectively	(1,295,949)	(1,294,262)
Total shareholders' equity	3,591,929	4,282,710
Noncontrolling interest	6,765	11,158
Total equity	3,598,694	4,293,868
Total liabilities and equity	$ 8,424,504	$ 9,537,840