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Debt (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Debt Disclosure [Abstract] |  |  |  |
Gross interest | $ 25,029 | $ 8,500 | $ 69,181 | $ 19,228
Capitalized interest | (1,163) | (3,388) | (7,642) | (8,726)
Interest expense | $ 23,866 | $ 5,112 | $ 61,539 | $ 10,502

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