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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Debt Disclosure [Abstract] |  |  |  |
Gross interest | $ 28,125 | $ 33,433 | $ 90,044 | $ 100,886
Capitalized interest | (1,533) | (582) | (3,171) | (1,577)
Interest expense | $ 26,592 | $ 32,851 | $ 86,873 | $ 99,309

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