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Merger and Other Acquisitions - Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Revenue since acquisition     $ 112,185  
Net earnings since acquisition     13,184  
Transaction and integration costs $ 33,877   33,877  
As Reported        
Total revenue 261,153 $ 169,532 626,335 $ 513,178
Net income (loss) $ (1,412) $ 11,173 $ 23,435 $ 41,300
Net income per basic share (in dollars per share) $ (0.04) $ 0.40 $ 0.77 $ 1.46
Net income per diluted share (in dollars per share) $ (0.04) $ 0.40 $ 0.77 $ 1.45
Pro Forma        
Total revenue     $ 1,308,967 $ 1,304,906
Net income     $ 80,556 $ 34,291
Net income per basic share (in dollars per share)     $ 1.66 $ 0.71
Net income per diluted share (in dollars per share)     $ 1.66 $ 0.71
Acquisition-related Costs [Member]        
As Reported        
Net income (loss)       $ (66,324)