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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Business Combinations [Abstract] |  |
Pro forma net revenues | $ 491,533 | $ 468,147
Pro forma net income | $ 31,397 | $ 32,356
Pro forma net income per share basic (in dollars per share) | $ 0.88 | $ 0.91
Pro forma net income per share diluted (in dollars per share) | $ 0.86 | $ 0.88

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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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