Equity - Narratives (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Distributions Per Share                      
Distributions declared per share, (usd per share) $ 0.1625 $ 0.1625 $ 0.1625 $ 0.1625 $ 0.1625 $ 0.1625 $ 0.1625 $ 0.1625 $ 0.65 $ 0.65 $ 0.6500
Distributions payable $ 55,830       $ 54,775       $ 55,830 $ 54,775  
Aggregate distributions payable $ 222,000               $ 222,000