Shareholders' Equity - Distribution (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Annual Per Share Distribution (in dollars per share)	$ 2.20	$ 2.20	$ 2.20
Total Distributions	$ 106,368	$ 106,121	$ 105,868
Characterization of Distribution, Return of Capital	0.00%	0.00%	0.00%
Characterization of Distribution, Ordinary Income	100.00%	100.00%	100.00%
Characterization of Distribution, Quality Dividend	0.00%	0.00%	0.00%