Stockholders' Equity - Quarterly Dividend and Special Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Total Distribution (in dollars per share)	$ 2.870000	$ 2.870000	$ 2.870000	$ 2.870000	$ 2.660000	$ 2.660000	$ 2.660000	$ 2.660000	$ 2.460000	$ 2.460000	$ 2.460000	$ 2.460000	$ 11.480000	$ 10.640000	$ 9.840000
Nonqualified Ordinary Dividend (in dollars per share)	$ 2.870000	$ 2.870000	$ 2.870000	$ 2.870000	$ 2.660000	$ 2.660000	$ 2.660000	$ 2.660000	$ 2.460000	$ 2.460000	$ 2.460000	$ 2.460000	$ 11.480000	$ 10.640000	$ 9.840000
Total Distribution Amount	$ 258,716	$ 257,769	$ 257,199	$ 256,321	$ 237,010	$ 236,424	$ 235,449	$ 227,386	$ 209,785	$ 209,226	$ 207,949	$ 198,933	$ 1,030,005	$ 936,269	$ 825,893