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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
	Jun. 30, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Pro forma combined revenues	$ 213,262	$ 424,033
Pro forma combined net income	$ 6,402	$ 17,868
Weighted-average common shares outstanding:
Basic	$ 0.24	$ 0.68
Diluted	$ 0.23	$ 0.66
Pro forma combined net income per share:
Basic	26,311	26,304
Diluted	27,334	27,103

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Business acquisitions pro forma weighted average common shares outstanding.

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