Other Assets (Schedule Of Other Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Cost	$ 62,016	$ 62,016
Goodwill, Net	62,016	62,016	$ 62,016
Total intangible assets	285,369	279,167
Intangible assets, Accumulated Amortization	(71,965)	(60,736)
Intangible assets, net	213,404	218,431
Available-for-sale investments	48,081	15,414
Cost-method investments	51,334	57,147
Turnaround costs	111,078	107,892
Turnaround costs, Accumulated Amortization	(74,943)	(56,493)
Turnaround costs, Net	36,135	51,399
Debt issuance costs, Cost	20,406	20,406
Debt issuance costs, Accumulated Amortization	(13,286)	(11,282)
Debt issuance costs, Net	7,120	9,124
Other, Costs	51,682	50,571
Other, Accumulated Amortization	(20,968)	(18,245)
Other, Net	30,714	32,326
Other assets, Cost	567,950	530,597
Other assets, Accumulated Amortization	(181,162)	(146,756)
Other assets, net	(386,788)	(383,841)
Total deferred charges and other assets, Cost	282,581	251,430
Total deferred charges and other assets, Accumulated Amortization	(109,197)	(86,020)
Total deferred charges and other assets, Net	$ 173,384	165,410
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	3 years
Licenses and intellectual property [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, Cost	$ 79,699	82,611
Intangible assets, Accumulated Amortization	(38,643)	(35,732)
Intangible assets, Net	$ 41,056	46,879
Weighted Average Life	15 years
Trademarks [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, Cost	$ 39,085	42,790
Intangible assets, Accumulated Amortization	(2,602)	(759)
Intangible assets, Net	$ 36,483	42,031
Weighted Average Life	20 years
Customer relationships [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, Cost	$ 75,249	75,249
Intangible assets, Accumulated Amortization	(22,572)	(17,374)
Intangible assets, Net	$ 52,677	57,875
Weighted Average Life	14 years
Other [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, Cost	$ 29,320	16,501
Intangible assets, Accumulated Amortization	(8,148)	(6,871)
Intangible assets, Net	$ 21,172	$ 9,630
Weighted Average Life	7 years