Components of Working Capital - Accrued Liabilities Table (details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Accrued Liabilities [Line Items]
Other accrued liabilities	$ 1,704		$ 1,241
Accrued interest expense	17,547		18,119
Short-term asset retirement obligations	1,310		1,966
Short-term remediation and reclamation obligations	562		562
Accrued liabilities	125,061	[1]	138,034	[1],[2]
Accrued Capital Expenditures [Member]
Accrued Liabilities [Line Items]
Other accrued liabilities	76,332		94,750
Accrued Plant Purchases [Member]
Accrued Liabilities [Line Items]
Other accrued liabilities	$ 27,606		$ 21,396

[1] Accrued liabilities includes amounts payable to affiliates of zero and $0.1 million as of March 31, 2014, and December 31, 2013, respectively.

[2] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.