Accrued Liabilities and Other Long-Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accrued liabilities
Accrued property, plant and equipment	$ 87,098	$ 65,908
Interest	27,458	26,607
Product and operations	22,969	31,241
Employee compensation	12,600	9,167
Taxes (other than income tax)	9,914	8,670
Other	11,412	12,276
Total accrued liabilities	171,451	153,869
Other long-term liabilities
SMR Liability	91,851	93,909
Deferred revenue	19,383	4,018
Asset retirement obligation	6,818	4,029	2,877
Other	3,304	3,393
Total other long-term liabilities	$ 121,356	$ 105,349