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Debt (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt
Gross interest cost	$ 33,077us-gaap_InterestCostsIncurred	$ 10,016us-gaap_InterestCostsIncurred
Capitalized interest	(13,196)us-gaap_InterestCostsIncurredCapitalized	(9,646)us-gaap_InterestCostsIncurredCapitalized
Interest expense	$ 19,881us-gaap_InterestExpense	$ 370us-gaap_InterestExpense

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

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Amount of interest capitalized, including amount of allowance for funds used during construction.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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Amount of the cost of borrowed funds accounted for as interest expense.

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