CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) Lease shares	Dec. 31, 2019 USD ($) shares	Jan. 01, 2019 USD ($)
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) | shares		0	0
Common stock issued through the dividend reinvestment plan (in shares) | shares	2,844	2,747	2,069
Common stock issued through the dividend reinvestment plan	$ 566	$ 458	$ 418
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) | shares	75,780	74,173	84,710
Shares withheld to satisfy employees' tax withholding and other liabilities, value	$ 13,463	$ 14,919	$ 16,101
Number of shares forfeited (in shares) | shares	4,109
Shares cancelled upon forfeiture	$ 804	1,240	399
Dividends payable	225,392	224,897
Change in redemption value of redeemable noncontrolling interest	1,022	(210)	373
Increase (decrease) in derivative assets	3,204	4,308	388
Cash flow hedge losses reclassified to earnings	(13,151)	(8,984)	(6,571)
Increase to other comprehensive income from derivative activity		1,413
Right of use lease assets	118,370	133,581
Total lease liabilities	146,377	161,313
Increase (decrease) in derivative liabilities			$ 6,379
Interest Expense
Supplemental disclosures of non-cash investing and financing activities
Cash flow hedge losses reclassified to earnings	7,887
Gain (Loss) on Extinguishment of Debt
Supplemental disclosures of non-cash investing and financing activities
Cash flow hedge losses reclassified to earnings	$ 5,264
New Office Leases
Supplemental disclosures of non-cash investing and financing activities
Right of use lease assets		46,875
Total lease liabilities		$ 46,875
Number of new office leases | Lease		2
Restricted stock and restricted stock converted from performance shares
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) | shares	155,836	165,545	152,502
Performance awards
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) | shares	138,033	77,182	80,512
Conversion of performance awards to restricted shares of common stock (in shares) | shares	56,545
Restricted stock
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) | shares	99,291	69,228	79,430
Fair value of shares issued	$ 17,757	$ 15,305	$ 15,603
Number of shares forfeited (in shares) | shares	4,109	7,683	2,361
Restricted stock converted from performance shares
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) | shares	0	96,317	73,072
Common stock
Supplemental disclosures of non-cash investing and financing activities
Dividends payable	$ 224,012	$ 223,262	$ 214,832
Accumulated earnings less dividends
Supplemental disclosures of non-cash investing and financing activities
Change in redemption value of redeemable noncontrolling interest	$ 1,022	$ (210)	$ 373
Restricted stock and deferred stock awards | Non-employee directors
Supplemental disclosures of non-cash investing and financing activities
Granted (in shares) | shares			1,838
Fair value of shares issued			$ 205
Accounting Standards Update 2016-02
Supplemental disclosures of non-cash investing and financing activities
Right of use lease assets				$ 122,276
Total lease liabilities				$ 122,276