Stockholder's Equity - Summary of Common Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares Issued
Dividend reinvestment plan issuances (in shares)		264,153	5,798,979
Option exercises (in shares)	338	251	10,736
Preferred stock conversions (in shares)			12,712,452
Stock incentive plans, net of forfeitures (in shares)	171,189	281,552	203,889
Totals (in shares)	29,838,875	7,345,934	26,582,012
Average Price
Dividend reinvestment plan issuances (in USD per share)		$ 72.33	$ 77.18
Option exercises (in USD per share)	$ 56.21	$ 47.81	$ 51.32
Gross Proceeds
Dividend reinvestment plan issuances		$ 19,105	$ 447,559
Option exercises	$ 19	12	551
Totals	2,385,702	607,189	1,062,058
Net Proceeds
Dividend reinvestment plan issuances		19,105	443,929
Option exercises	19	12	551
ATM Program issuances	2,348,201	595,313	1,056,125
Totals	$ 2,348,201	$ 595,313	$ 1,056,125
At The Market Program
Shares Issued
ATM Program issuances (in shares)	29,667,348	6,799,978	7,855,956
Average Price
ATM Program issuances (in dollars per share)	$ 80.41	$ 86.48	$ 78.15
Gross Proceeds
ATM Program issuances	$ 2,385,683	$ 588,072	$ 613,948
Net Proceeds
ATM Program issuances	$ 2,348,182	$ 576,196	$ 611,645