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Acquisitions (Business Acquisition, Pro Forma Information) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition, Pro Forma Information [Abstract] |  |  |
Revenues | $ 2,178,954 | $ 1,960,851 | $ 1,582,699
Operating income | 79,159 | 65,152 | 54,947
Net income | $ 105,387 | $ 68,841 | $ 88,319
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic | $ 1.50 | $ 1.20 | $ 1.03
Basic earnings per share (in dollars per share) | 2.00 | 1.27 | 1.65
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | 1.48 | 1.18 | 1.01
Diluted earnings per share (in dollars per share) | $ 1.97 | $ 1.25 | $ 1.62
Weighted average number of shares outstanding | 52,632 | 54,232 | 53,481
Weighted average number of shares and dilutive shares outstanding | 53,411 | 55,124 | 54,555

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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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