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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Debt Disclosure [Abstract] |  |  |  |
Gross interest | $ 33,341 | $ 29,427 | $ 65,078 | $ 61,919
Capitalized interest | (1,363) | (1,035) | (3,799) | (1,638)
Interest expense | $ 31,978 | $ 28,392 | $ 61,279 | $ 60,281

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