CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 447,766,000	$ 336,997,000
Short-term investments	34,036,000	28,369,000
Accounts receivable, net	756,320,000	698,477,000
Inventory, net	165,587,000	166,307,000
Assets held for sale	12,250,000	37,052,000
Other current assets	177,604,000	180,134,000
Total current assets	1,593,563,000	1,447,336,000
Property, plant and equipment, net	5,467,870,000	6,109,565,000
Goodwill	183,914,000	173,226,000
Deferred income taxes	345,091,000	419,003,000
Other long-term assets	263,506,000	252,854,000
Total assets (1)	7,853,944,000	8,401,984,000
Current liabilities:
Current portion of debt	561,000	181,000
Trade accounts payable	392,843,000	363,416,000
Accrued liabilities	417,912,000	533,044,000
Income taxes payable	20,761,000	22,835,000
Total current liabilities	832,077,000	919,476,000
Long-term debt	3,585,884,000	4,027,766,000
Other long-term liabilities	274,485,000	301,633,000
Deferred income taxes	6,311,000	10,338,000
Total liabilities (1)	4,698,757,000	5,259,213,000
Commitments and contingencies (Note 17)
Redeemable noncontrolling interest in subsidiary (Note 14)	404,861,000	203,998,000
Shareholders' equity:
Preferred shares, par value $0.001 per share: Series A 6% Cumulative Mandatory Convertible; $50 per share liquidation preference; issued 5,750	6,000
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 409,652 and 367,510, respectively	410,000	368,000
Capital in excess of par value	3,392,937,000	2,791,129,000
Accumulated other comprehensive income (loss)	(29,325,000)	11,185,000
Retained earnings	650,842,000	1,423,154,000
Less: treasury shares, at cost, 52,800 and 52,800 common shares, respectively	(1,314,020,000)	(1,314,020,000)
Total shareholders' equity	2,700,850,000	2,911,816,000
Noncontrolling interest	49,476,000	26,957,000
Total equity	2,750,326,000	2,938,773,000
Total liabilities and equity	$ 7,853,944,000	$ 8,401,984,000