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Business Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Business Combinations [Abstract] |  |
Pro forma net revenues | $ 236,000 | $ 220,000
Pro forma net income | $ 15,700 | $ 14,400
Pro forma net income (loss) per share basic (in dollars per share) | $ 0.44 | $ 0.41
Pro forma net income (loss) per share diluted (in dollars per share) | $ 0.42 | $ 0.39

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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