Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Unaudited Pro Forma Financial Information) (Details)

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Acquisitions (Unaudited Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Combinations [Abstract]        
Revenues $ 181,880 $ 107,966 $ 506,864 $ 326,357
Income from operations 82,057 42,556 238,776 124,005
Income available to common stockholders $ 44,703 $ 26,387 $ 175,623 $ 128,716
Net income per common share:        
Basic (in dollars per share) $ 0.20 $ 0.13 $ 0.82 $ 0.64
Diluted (in dollars per share) $ 0.20 $ 0.13 $ 0.82 $ 0.64