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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, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Pro forma combined revenues | $ 214,625 | $ 638,658
Pro forma combined net income | $ 13,883 | $ 31,751
Weighted-average common shares outstanding: |  |
Basic | 26,312 | 26,326
Diluted | 28,137 | 27,493
Pro forma combined net income per share: |  |
Basic | $ 0.53 | $ 1.21
Diluted | $ 0.49 | $ 1.15

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- Definition 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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