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Debt (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt
Gross interest	$ 23,913	$ 6,298	$ 44,152	$ 10,728
Capitalized interest	(1,910)	(2,410)	(6,479)	(5,338)
Interest expense	$ 22,003	$ 3,888	$ 37,673	$ 5,390

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

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