Equity (Details 2) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jul. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	280,000,000		280,000,000
Preferred stock, shares authorized (in shares)	50,000,000		50,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	2,126
Common stock issued through the dividend reinvestment plan (in shares)	839	529
Number of shares of stock grants withheld (in shares)	74,726	70,351
Stock issued during period, shares, share-based compensation, forfeited (in shares)	343
Treasury Stock, Shares, Acquired	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 316,148,000
Proceeds from Issuance of Common Stock	11,000	$ 125,000
2020 Stock Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 500,000,000
Amended 2005 Stock Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 500,000,000
Continuous Equity Program CEP V [Member]
Class of Stock [Line Items]
Maximum value of shares of common stock that can be sold (in dollars)	1,000,000,000
Common stock value, remaining to be authorized under continuous equity program	752,878,000
Proceeds from Issuance of Common Stock	$ 0
Maximum | Continuous Equity Program CEP V [Member]
Class of Stock [Line Items]
Percentage of compensation received by sales agent	1.50%
Restricted Stock and Restricted Stock Converted From Performance Shares
Class of Stock [Line Items]
Equity instruments granted (in shares)	149,520	161,229