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Acquisitions - Pro Forma Information (Details) - Sanbolic, Inc. and Grasshopper Group, LLC [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]        
Revenues $ 813,309 $ 766,282 $ 2,384,428 $ 2,310,979
Income from operations 63,837 53,260 229,379 166,384
Net income $ 55,949 $ 44,005 $ 182,685 $ 144,398
Per share - basic (USD per share) $ 0.35 $ 0.27 $ 1.14 $ 0.84
Per share - diluted (USD per share) $ 0.35 $ 0.27 $ 1.13 $ 0.83