Dividends - Schedule of Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Cash dividend paid per common share (in dollars per share)	$ 0.20500	$ 0.20375	$ 0.20250	$ 0.20125	$ 0.82	$ 0.80	$ 0.78
Total cash dividends paid	$ 15,322	$ 15,222	$ 15,128	$ 15,033	$ 60,705	$ 58,951	$ 57,201