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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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