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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net capitalized interest | $ 647 | $ 513 | $ 460
Common Stock |  |  |
Company's common stock surrendered in exchange for the exercise of stock options (in shares) | 43 | 0 | 14

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