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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 net revenues	$ 843,484	$ 794,265
Pro forma combined net income	$ 23,107	$ 28,338
Pro forma combined net income per share:
Basic	$ 0.88	$ 1.08
Diluted	$ 0.83	$ 1.07
Weighted-average common shares outstanding:
Basic	26,342	26,181
Diluted	27,897	26,500

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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-Name Accounting Standards Codification
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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