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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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Business acquisitions pro forma weighted average common shares outstanding.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
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