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Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combinations [Abstract] |  |  |
Revenues | $ 873,427 | $ 924,806 | $ 942,547
Net income | $ 91,602 | $ 118,232 | $ 89,184
Earnings per share: |  |  |
Basic earnings per share (in dollars per share) | $ 0.46 | $ 0.59 | $ 0.44
Diluted earnings per share (in dollars per share) | $ 0.45 | $ 0.59 | $ 0.44

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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=79982066&loc=d3e1392-128463 + Details
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