CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) Lease shares	Mar. 31, 2019 USD ($) shares	Jan. 01, 2019 USD ($)
Supplemental disclosures of non-cash investing and financing activities
Common stock issued through the dividend reinvestment plan (in shares) | shares	529	602
Common stock issued through the dividend reinvestment plan	$ 112	$ 108
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) | shares	70,351	75,195
Shares withheld to satisfy employees' tax withholding and other liabilities, value	$ 14,346	$ 14,206
Stock issued during period, shares, share-based compensation, forfeited (in shares) | shares	3,931
Stock issued during period, value, share-based compensation, forfeited	$ 660	102
Dividends declared but not paid	225,714
Change in redemption value of redeemable noncontrolling interest	(471)	224
Loss on cash flow hedges	(17,603)	(7,231)
Cash flow hedge losses reclassified to earnings	(1,949)	$ (1,468)
Operating Lease, Right-of-Use Asset	140,499
Total lease liabilities	164,829
Increase (Decrease) in Derivative Assets	$ 22
Restricted Stock and Restricted Stock Converted From Performance Shares
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares) | shares	161,229	148,004
Restricted Stock Converted From Performance Shares
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares) | shares	96,317	73,072
Restricted stock
Supplemental disclosures of non-cash investing and financing activities
Equity instruments granted (in shares) | shares	64,912	74,932
Fair value of shares issued	$ 14,640	$ 14,666
Stock issued during period, shares, share-based compensation, forfeited (in shares) | shares	3,931	616
Common stock
Supplemental disclosures of non-cash investing and financing activities
Dividends declared but not paid	$ 224,079	$ 212,166
Accumulated earnings less dividends
Supplemental disclosures of non-cash investing and financing activities
Change in redemption value of redeemable noncontrolling interest	(471)	$ 224
Accounting Standards Update 2016-02
Supplemental disclosures of non-cash investing and financing activities
Operating Lease, Right-of-Use Asset			$ 122,276
Total lease liabilities			$ 122,276
New Office Leases
Supplemental disclosures of non-cash investing and financing activities
Operating Lease, Right-of-Use Asset	$ 46,875
Number of New Office Leases | Lease	2
Total lease liabilities	$ 46,875