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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
Lease
shares
Supplemental disclosures of non-cash investing and financing activities    
Common stock issued through the dividend reinvestment plan (in shares) | shares 839 529
Common stock issued through the dividend reinvestment plan $ 138 $ 112
Number of shares withheld to satisfy employees' tax withholding and other liabilities (in shares) | shares 74,726 70,351
Shares withheld to satisfy employees' tax withholding and other liabilities, value $ 13,228 $ 14,346
Stock issued during period, shares, share-based compensation, forfeited (in shares) | shares 343  
Stock issued during period, value, share-based compensation, forfeited $ 69 660
Dividends declared but not paid 223,805  
Change in redemption value of redeemable noncontrolling interest (273) 471
Cash flow hedge losses reclassified to earnings 2,367 1,949
Operating Lease, Right-of-Use Asset 131,269  
Total lease liabilities $ 159,813  
Increase (Decrease) in Derivative Liabilities   3,302
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 149,520 161,229
Restricted Stock Converted From Performance Shares    
Supplemental disclosures of non-cash investing and financing activities    
Equity instruments granted (in shares) | shares 0 96,317
Restricted stock    
Supplemental disclosures of non-cash investing and financing activities    
Equity instruments granted (in shares) | shares 92,975 64,912
Fair value of shares issued $ 16,347 $ 14,640
Stock issued during period, shares, share-based compensation, forfeited (in shares) | shares 343 3,931
Performance Shares    
Supplemental disclosures of non-cash investing and financing activities    
Equity instruments granted (in shares) | shares 137,929  
Converted to restricted stock (in shares) | shares 56,545  
Common stock    
Supplemental disclosures of non-cash investing and financing activities    
Dividends declared but not paid $ 222,424 $ 224,079
Accumulated earnings less dividends    
Supplemental disclosures of non-cash investing and financing activities    
Change in redemption value of redeemable noncontrolling interest $ (273) 471
Accounting Standards Update 2016-02    
Supplemental disclosures of non-cash investing and financing activities    
Operating Lease, Right-of-Use Asset   46,875
Total lease liabilities   $ 46,875
New Office Leases    
Supplemental disclosures of non-cash investing and financing activities    
Number of New Office Leases | Lease   2