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Stockholders' Equity Matters - Additional Information (Details) $ / shares in Units, $ in Thousands															1 Months Ended	3 Months Ended	12 Months Ended
	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, 2016 $ / shares	Jul. 27, 2016 $ / shares	May 25, 2016 $ / shares	Feb. 17, 2016 $ / shares	Oct. 31, 2017 USD ($) bank	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares
Class of Stock [Line Items]
Amount of declared distributions																	$ 679,130	$ 603,743	$ 502,863
Dividends per share (in dollars per share) | $ / shares	$ 0.6110	$ 0.5875	$ 0.5875	$ 0.5875			$ 0.5875	$ 0.55	$ 0.55	$ 0.55	$ 0.55	$ 0.485	$ 0.485	$ 0.485			$ 2.3753	$ 2.2706	$ 2.0427
Common stock, par value (in dollars per share) | $ / shares																$ 0.01	$ 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
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	$ 60,000
Sale of stock, consideration received on transaction																	8,716	59,100
Payment of stock trading commission costs																	90	$ 900
Sale of stock, remaining aggregate sale price of stock available for distribution																$ 431,200	$ 431,200
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
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

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