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Acquisition of RSI Communities - Summary of Unaudited Pro Forma Amounts of RSI Communities Acquisition (Details) - RSI Communities - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Operating revenues $ 401,600 $ 258,854
Net income (loss) available to common stockholders $ 6,419 $ (10,767)
Income per share - basic (in USD per share) $ 0.17 $ (0.29)
Income per share - diluted (in USD per share) $ 0.16 $ (0.29)