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Accrued Liabilities and Deferred Credits (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accrued compensation	$ 3,558	$ 3,529
Deferred revenue	29,768	27,962
Environmental and insurance liabilities	1,515	1,621
Accrued property taxes	4,294	0
Other accrued liabilities	14,016	9,240
Total accrued liabilities and deferred credits	$ 53,151	$ 42,352

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.