Equity - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands								3 Months Ended		9 Months Ended
	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Nov. 15, 2017	Aug. 15, 2017	May 16, 2017	Feb. 15, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Distributions
Dividends per Common Share (in dollars per share)	$ 0.132	$ 0.1200	$ 0.12	$ 0.12	$ 0.1200	$ 0.12	$ 0.1200	$ 0.132	$ 0.1200	$ 0.372	$ 0.36
Total Dividends	$ 17,114	$ 15,486	$ 8,532	$ 8,536	$ 8,536	$ 8,534	$ 8,458			$ 41,132	$ 25,528