CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 200,674	$ 254,530
Short-term investments	20,827	20,059
Assets held for sale	80,100	75,678
Accounts receivable, net	594,506	784,671
Inventory	153,837	153,824
Other current assets	209,443	187,135
Total current assets	1,259,387	1,475,897
Property, plant and equipment, net	6,942,315	7,027,802
Goodwill	167,217	166,659
Investment in unconsolidated affiliates	94,657	415,177
Other long-term assets	486,755	452,305
Total assets	8,950,331	9,537,840
Current liabilities:
Current portion of debt	5,880	6,508
Trade accounts payable	250,078	271,984
Accrued liabilities	572,025	686,613
Income taxes payable	43,285	41,394
Total current liabilities	871,268	1,006,499
Long-term debt	3,584,402	3,655,200
Other long-term liabilities	565,086	552,947
Deferred income taxes	13,378	29,326
Total liabilities	$ 5,034,134	$ 5,243,972
Commitments and contingencies (Note 8)
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 331,675 and 320,526, respectively	$ 332	$ 331
Capital in excess of par value	2,497,283	2,493,100
Accumulated other comprehensive income (loss)	(13,264)	(47,593)
Retained earnings	2,715,918	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	3,904,320	4,282,710
Noncontrolling interest	11,877	11,158
Total equity	3,916,197	4,293,868
Total liabilities and equity	$ 8,950,331	$ 9,537,840