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Acquisitions - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Combinations [Abstract]    
Revenues $ 873,427 $ 924,806
Net income $ 91,602 $ 118,232
Earnings per share:    
Net income per share available to common stockholders - basic (in dollars per share) $ 0.46 $ 0.59
Net income per share available to common stockholders - diluted (in dollars per share) $ 0.45 $ 0.59