Stockholders' Equity and Partners' Capital - Summary of Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
May 31, 2018
May 29, 2018
Mar. 05, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]              
Preferred stock, dividend per share (in dollars per share) $ 0.375   $ 0.375        
Preferred stock, total amount   $ 2,588 $ 2,588     $ 5,176  
Common stock, dividend per share (in dollars per share)   $ 0.18000 $ 0.18000 $ 0.18 $ 0.18 $ 0.36 $ 0.36
Common stock, total amount   $ 77,143 $ 78,581     $ 155,724