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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement Of Cash Flows [Abstract] |  |  |
Interest expense, capitalized interest | $ 1,435 | $ 1,175 | $ 398

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