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Other Assets (Schedule Of Other Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill, Cost $ 29,990 $ 29,990
Goodwill, Net 29,990 29,990
Other intangible assets, Net 3,230 1,161
Total intangible assets 101,920 100,130
Intangible assets, Accumulated Amortization (53,628) (51,067)
Intangible assets, net 48,292 49,063
Available-for-sale investments 0 30,113
Notes receivable from affiliate 1,192 2,383
Turnaround costs 83,726 86,728
Turnaround costs, Accumulated Amortization (54,666) (57,175)
Turnaround costs, Net 29,060 29,553
Debt issuance costs, Cost 19,219 20,628
Debt issuance costs, Accumulated Amortization (8,149) (8,989)
Debt issuance costs, Net 11,070 11,639
Other, Costs 27,736 22,502
Other, Accumulated Amortization (10,351) (9,678)
Other, Net 17,385 12,824
Other assets, Cost 233,793 262,484
Other assets, Accumulated Amortization (126,794) (126,909)
Other assets, Net 106,999 135,575
Turnaround Costs [Member]
    
Goodwill and Intangible Assets Disclosure [Abstract]    
Weighted Average Life 5 years  
Debt Issuance Costs [Member]
    
Goodwill and Intangible Assets Disclosure [Abstract]    
Weighted Average Life 13 years  
Other, Net [Member]
    
Goodwill and Intangible Assets Disclosure [Abstract]    
Weighted Average Life 4 years  
Technology Licenses [Member]
    
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangible assets, Cost 44,548 44,827
Intangible assets, Accumulated Amortization (41,413) (40,860)
Intangible assets, Net 3,135 3,967
Weighted Average Life 12 years  
Patents [Member]
    
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangible assets, Cost 6,503 6,503
Intangible assets, Accumulated Amortization (3,956) (3,306)
Intangible assets, Net 2,547 3,197
Weighted Average Life 10 years  
Customer Relationships [Member]
    
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangible assets, Cost 17,649 17,649
Intangible assets, Accumulated Amortization (8,259) (6,901)
Intangible assets, Net $ 9,390 $ 10,748
Weighted Average Life 13 years