Shareholders' Equity - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 14, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Share Distributions
Annual Per Share Distribution (in dollars per share)		$ 0.57	$ 2.15	$ 2.11
Total Distribution		$ 93,804	$ 353,620	$ 346,832
Ordinary Income		0.00%	44.50%	100.00%
Capital Gain		0.00%	37.93%	0.00%
Return of Capital		100.00%	17.57%	0.00%
Qualified Dividend		0.00%	0.50%	0.00%
Subsequent event
Common Share Distributions
Total Distribution	$ 1,648
Cash distributions paid or payable (in dollars per share)	$ 0.01