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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	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Pro forma combined revenues	$ 843,589	$ 791,372
Pro forma combined net income	$ 23,131	$ 28,200
Pro forma combined net income per share:
Basic	26,342	26,181
Diluted	27,897	26,500
Weighted-average common shares outstanding:
Basic	$ 0.88	$ 1.08
Diluted	$ 0.83	$ 1.06

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Business acquisitions pro forma weighted average common shares outstanding.

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