CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents		$ 347,525	$ 336,997
Short-term investments		41,033	28,369
Accounts receivable, net		775,137	698,477
Inventory, net		166,827	166,307
Assets held for sale		20,289	37,052
Other current assets		188,229	180,134
Total current assets		1,539,040	1,447,336
Property, plant and equipment, net		5,608,948	6,109,565
Goodwill		172,976	173,226
Deferred income taxes		407,851	419,003
Other long-term assets		231,732	252,854
Total assets (1)	[1]	7,960,547	8,401,984
Current liabilities:
Current portion of debt		433	181
Trade accounts payable		331,713	363,416
Accrued liabilities		392,476	533,044
Income taxes payable		27,770	22,835
Total current liabilities		752,392	919,476
Long-term debt		3,737,273	4,027,766
Other long-term liabilities		272,607	301,633
Deferred income taxes		23,782	10,338
Total liabilities (1)	[1]	4,786,054	5,259,213
Commitments and contingencies (Note 7)
Redeemable noncontrolling interest in subsidiary (Note 3)		210,665	203,998
Shareholders' equity:
Preferred shares, par value $0.001 per share: Series A 6% Cumulative Mandatory Convertible; $50 per share liquidation preference; issued 5,750		6
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 410,160 and 367,510, respectively		410	368
Capital in excess of par value		3,387,922	2,791,129
Accumulated other comprehensive income (loss)		(7,115)	11,185
Retained earnings		864,019	1,423,154
Less: treasury shares, at cost, 52,800 and 52,800 common shares, respectively		(1,314,020)	(1,314,020)
Total shareholders' equity		2,931,222	2,911,816
Noncontrolling interest		32,606	26,957
Total equity		2,963,828	2,938,773
Total liabilities and equity		$ 7,960,547	$ 8,401,984

[1] The condensed consolidated balance sheet as of September 30, 2018 and December 31, 2017 include assets and liabilities of variable interest entities. See Note 3—Joint Ventures for additional information.