CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents		$ 367,039	$ 336,997
Short-term investments		26,548	28,369
Accounts receivable, net		733,541	698,477
Inventory, net		174,308	166,307
Assets held for sale		36,404	37,052
Other current assets		156,533	180,134
Total current assets		1,494,373	1,447,336
Property, plant and equipment, net		5,969,063	6,109,565
Goodwill		172,982	173,226
Deferred income taxes		417,781	419,003
Other long-term assets		245,631	252,854
Total assets	[1]	8,299,830	8,401,984
Current liabilities:
Current portion of debt		375	181
Trade accounts payable		309,883	363,416
Accrued liabilities		432,294	533,044
Income taxes payable		24,276	22,835
Total current liabilities		766,828	919,476
Long-term debt		4,256,160	4,027,766
Other long-term liabilities		321,652	301,633
Deferred income taxes		11,786	10,338
Total liabilities	[1]	5,356,426	5,259,213
Commitments and contingencies (Note 7)
Redeemable noncontrolling interest in subsidiary (Note 3)		206,396	203,998
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 370,320 and 367,510, respectively		370	368
Capital in excess of par value		2,797,893	2,791,129
Accumulated other comprehensive income (loss)		(7,151)	11,185
Retained earnings		1,232,516	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		2,709,608	2,911,816
Noncontrolling interest		27,400	26,957
Total equity		2,737,008	2,938,773
Total liabilities and equity		$ 8,299,830	$ 8,401,984

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