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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, 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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Business acquisitions pro forma weighted average common shares outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
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