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Stockholders' Equity Matters - Additional Information (Details)															1 Months Ended	12 Months Ended
	Oct. 31, 2019 $ / shares	Jul. 26, 2019 $ / shares	May 22, 2019 $ / shares	Feb. 07, 2019 $ / shares	Oct. 25, 2018 $ / shares	Jul. 24, 2018 $ / shares	May 24, 2018 $ / shares	Feb. 14, 2018 $ / shares	Jan. 02, 2018 USD ($)	Dec. 12, 2017 USD ($) bank $ / shares shares	Oct. 24, 2017 $ / shares	Jul. 27, 2017 $ / shares	May 24, 2017 $ / shares	Feb. 15, 2017 $ / shares	Oct. 31, 2017 USD ($) bank	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Class of Stock [Line Items]
Amount of declared distributions																$ 703,752,000	$ 679,130,000	$ 603,743,000
Dividends per share (in dollars per share) | $ / shares	$ 0.6185	$ 0.6110	$ 0.6110	$ 0.6110	$ 0.6110	$ 0.5875	$ 0.5875	$ 0.5875			$ 0.5875	$ 0.5500	$ 0.5500	$ 0.5500		$ 2.45	$ 2.38	$ 2.27
Percent of dividends paid																100.00%	100.00%	100.00%
Sale of stock consideration received on transaction, gross																$ 0	$ 8,716,000	$ 59,129,000
Common stock, par value (in dollars per share) | $ / shares																$ 0.01	$ 0.01
At The Market (ATM) Equity Program
Class of Stock [Line Items]
Number of banks | bank															10
Sale of stock, authorized amount															$ 500,000,000
Sale of stock, number of shares issued in transaction (in shares) | shares																0	273,486	1,481,053
Sale of stock consideration received on transaction, gross																	$ 8,800,000	$ 60,000,000
Sale of stock, consideration received on transaction																	8,716,000	59,100,000
Payment of stock trading commission costs																	$ 90,000	$ 900,000
Sale of stock, remaining aggregate sale price of stock available for distribution																$ 431,200,000
Equity Offering
Class of Stock [Line Items]
Number of banks | bank										16
Sale of stock, number of shares issued in transaction (in shares) | shares										14,500,000
Sale of stock, consideration received on transaction										$ 516,462,000
Common stock, par value (in dollars per share) | $ / shares										$ 37.00
Payments of stock issuance costs per share (in dollars per share) | $ / shares										$ 1.38195
Over-Allotment Option
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares) | shares										2,175,000
Sale of stock, consideration received on transaction									$ 76,200,000
Capital gains
Class of Stock [Line Items]
Percent of dividends paid																14.70%	5.80%	0.00%

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