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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Disclosure [Abstract] |  |  |
Gross interest cost | $ 118,276 | $ 133,137 | $ 98,103
Capitalized interest | (5,656) | (2,290) | (8,690)
Interest expense | $ 112,620 | $ 130,847 | $ 89,413

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