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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 | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Business Acquisition [Line Items] |  |
Pro forma combined revenues | $ 242,473 | $ 480,705
Pro forma combined net income | $ 2,364 | $ 7,519
Weighted-average common shares outstanding: |  |
Basic | 28,317 | 28,189
Diluted | 30,575 | 30,439
Pro forma combined net income per share: |  |
Basic | $ 0.08 | $ 0.27
Diluted | $ 0.08 | $ 0.25

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