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Summarized Financial Information of Unconsolidated Joint Ventures (Assets, Liabilities, and Equity) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Equity Method Investments and Joint Ventures [Abstract] |  |
Current assets | $ 40,934 | $ 33,951
Noncurrent assets | 4,947 | 5,545
Current liabilities | 9,519 | 7,485
Shareholders’ equity | $ 36,362 | $ 32,011

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