SMR Transaction (Details) (USD $)	0 Months Ended
	Sep. 01, 2009	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Property, plant and equipment, net of accumulated depreciation of $14,926 and $9,658, respectively		$ 5,075,628,000	$ 2,864,307,000
Accumulated depreciation		624,548,000	438,062,000
LIABILITIES
Accrued liabilities		391,352,000	171,451,000
Other long-term liabilities		134,340,000	121,356,000
SMR Transaction
Divestitures
Proceeds from SMR Transaction	73,100,000
Imputed interest rate on SMR liability (as a percent)		9.35%
ASSETS
Property, plant and equipment, net of accumulated depreciation of $14,926 and $9,658, respectively		90,437,000	95,705,000
Accumulated depreciation		14,926,000	9,658,000
LIABILITIES
Accrued liabilities		2,259,000	2,058,000
Other long-term liabilities		$ 89,592,000	$ 91,851,000