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Summary of Unaudited Pro Forma Combined Financial Information (Details) - American Acquisition [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Pro forma combined revenues | $ 233,102 | $ 713,807
Pro forma combined net income (loss) | $ (1,453) | $ 6,066
Weighted-average common shares outstanding: |  |
Basic | 28,566 | 28,316
Diluted | 28,566 | 30,103
Pro forma combined net income (loss) per share: |  |
Basic | $ (0.05) | $ 0.21
Diluted | $ (0.05) | $ 0.20

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