Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 790,078	$ 825,901
Marketable securities	124,873	0
Accounts receivable, net	400,159	407,372
Inventories	399,298	490,777
Prepaid expenses and other current assets	14,700	12,495
Deferred income taxes	22,305	19,611
Total current assets	1,751,413	1,756,156
Property, plant and equipment, net	1,510,048	1,232,066
Equity investments	43,736	46,741
Restricted cash	0	96,283
Intangible assets, net	48,292	49,063
Deferred charges and other assets, net	58,707	86,512
Other assets, net	106,999	135,575
Total assets	3,412,196	3,266,821
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable, current	217,050	227,034
Accrued liabilities	181,460	137,561
Total current liabilities	398,510	364,595
Long-term debt	763,761	764,563
Deferred income taxes	326,290	330,791
Other liabilities	51,379	50,560
Total liabilities	1,539,940	1,510,509
Commitments and contingencies (Notes 7 and 18)
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value, 150,000,000 shares authorized; 67,187,224 and 66,601,909 shares issued at December 31, 2012 and 2011, respectively	672	666
Common stock, held in treasury, at cost; 284,493 and 69,816 shares at December 31, 2012 and 2011, respectively	(13,302)	(2,518)
Additional paid-in capital	496,254	467,796
Retained earnings	1,399,472	1,299,438
Accumulated other comprehensive loss	(10,840)	(9,070)
Total stockholders' equity	1,872,256	1,756,312
Total liabilities and stockholders' equity	$ 3,412,196	$ 3,266,821