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Segment Information (Details 2) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating income (loss)                        
Profit sharing                 $ (26,987,000) $ (43,149,000) $ (25,476,000)  
Operating income 94,929,000 72,721,000 103,699,000 119,816,000 82,490,000 108,785,000 188,219,000 205,326,000 391,165,000 584,820,000 364,753,000  
Assets                        
Cash and equivalents 375,917,000       390,761,000       375,917,000 390,761,000 186,513,000 9,008,000
Investments in short-term commercial paper 31,520,000       84,830,000       31,520,000 84,830,000    
Income taxes receivable 893,000       16,722,000       893,000 16,722,000    
Deferred income taxes 23,449,000       25,341,000       23,449,000 25,341,000    
Property, plant and equipment, net 2,231,198,000       2,193,745,000       2,231,198,000 2,193,745,000    
Other 132,816,000       134,264,000       132,816,000 134,264,000    
Total assets 5,815,416,000       5,979,226,000       5,815,416,000 5,979,226,000 5,589,934,000  
Liabilities                        
Accounts payable 360,097,000       420,824,000       360,097,000 420,824,000    
Income taxes payable 16,941,000       10,880,000       16,941,000 10,880,000    
Accrued interest 35,306,000       36,265,000       35,306,000 36,265,000    
Debt 2,202,237,000       2,380,100,000       2,202,237,000 2,380,100,000    
Deferred income taxes 537,304,000       489,915,000       537,304,000 489,915,000    
Liabilities 3,338,760,000       3,608,632,000       3,338,760,000 3,608,632,000 3,458,804,000  
Other
                       
Operating income (loss)                        
Corporate SG & A                 (32,300,000) (46,700,000) (31,600,000)  
Company-wide equity- based compensation                 (8,300,000) (14,800,000) (12,500,000)  
Profit sharing                 (20,500,000) (35,100,000) (21,100,000)  
Other, net                 (5,700,000) 1,500,000 (1,000,000)  
Operating income                 (66,829,000) (95,141,000) (66,189,000)  
Assets                        
Cash and equivalents 327,100,000       314,900,000       327,100,000 314,900,000 175,300,000  
Investments in short-term commercial paper 31,500,000       84,800,000       31,500,000 84,800,000    
Income taxes receivable 900,000       16,700,000       900,000 16,700,000 37,300,000  
Deferred income taxes 23,400,000       25,300,000       23,400,000 25,300,000 20,700,000  
Property, plant and equipment, net 75,500,000       85,700,000       75,500,000 85,700,000 70,700,000  
Debt issuance costs 27,900,000       23,900,000       27,900,000 23,900,000 23,300,000  
Intra-company debt 141,100,000       152,800,000       141,100,000 152,800,000 134,800,000  
Other 86,700,000       85,200,000       86,700,000 85,200,000 100,900,000  
Total assets 714,069,000       789,322,000       714,069,000 789,322,000 562,961,000  
Liabilities                        
Accounts payable 32,200,000       28,700,000       32,200,000 28,700,000 32,500,000  
Income taxes payable 17,100,000       11,100,000       17,100,000 11,100,000 5,200,000  
Accrued interest 35,100,000       33,700,000       35,100,000 33,700,000 33,700,000  
Accrued profit sharing 20,700,000       35,800,000       20,700,000 35,800,000 21,500,000  
Debt 2,152,200,000       2,341,900,000       2,152,200,000 2,341,900,000 2,341,000,000  
Deferred income taxes 218,200,000       217,600,000       218,200,000 217,600,000 242,700,000  
Other 22,300,000       91,100,000       22,300,000 91,100,000 70,200,000  
Liabilities $ 2,497,750,000       $ 2,759,894,000       $ 2,497,750,000 $ 2,759,894,000 $ 2,746,798,000