Stockholders' Equity and Partners' Capital - Schedule of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 05, 2018 |
Aug. 27, 2018 |
May 29, 2018 |
Mar. 05, 2018 |
Dec. 08, 2017 |
Sep. 15, 2017 |
Jun. 15, 2017 |
Mar. 15, 2017 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Equity [Abstract] | ||||||||||||||||||
| Preferred stock, dividend per share (in dollars per share) | $ 0.3750 | $ 0.3750 | $ 0.3750 | $ 0.3750 | $ 0.36667 | $ 1.5 | ||||||||||||
| Preferred stock, total amount | $ 2,588 | $ 2,588 | $ 2,588 | $ 2,588 | $ 2,530 | $ 10,352 | $ 2,530 | |||||||||||
| Common stock, dividend per share (in dollars per share) | $ 0.625 | $ 0.625 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.625 | $ 0.625 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.9 | $ 0.9 | $ 3.05 | $ 3.6 |
| Common stock, total amount | $ 53,617 | $ 53,560 | $ 77,143 | $ 78,581 | $ 80,796 | $ 82,062 | $ 82,422 | $ 87,122 | $ 262,901 | $ 332,402 | ||||||||