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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Statement of Cash Flows [Abstract] |  |
Net capitalized interest | $ 345 | $ 679
Common stock surrendered in exchange for exercise of stock options (in shares) | 3 | 39

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