DEBT (Summary Of The Balances Outstanding And Interest Rate Spread) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Short-term Debt
Line of Credit	$ 118,684	$ 118,684
Unsecured term loan	496,306	496,085
Term Loans:
Short-term Debt
Unsecured term loan	496,306	496,085
Deferred Loan Costs	(1,175)	(1,396)
$250 Million Senior Revolving Line Of Credit (Line of Credit) | Line of Credit
Short-term Debt
Line of Credit	118,684	118,684
$250 Million Term Loan (First Term Loan) | Term Loans:
Short-term Debt
Unsecured term loan	192,404	192,404
$300 Million Senior Term Loan Agreement (Second Term Loan) | Term Loans:
Short-term Debt
Unsecured term loan	278,846	278,846
$200 Million Senior Term Loan Agreement (Third Term Loan) | Term Loans:
Short-term Debt
Unsecured term loan	$ 26,231	$ 26,231
Minimum | $250 Million Senior Revolving Line Of Credit (Line of Credit) | Line of Credit
Short-term Debt
Basis spread on variable rate (percentage)	1.50%
Minimum | $250 Million Term Loan (First Term Loan) | Term Loans:
Short-term Debt
Basis spread on variable rate (percentage)	1.45%
Minimum | $300 Million Senior Term Loan Agreement (Second Term Loan) | Term Loans:
Short-term Debt
Basis spread on variable rate (percentage)	1.35%
Minimum | $200 Million Senior Term Loan Agreement (Third Term Loan) | Term Loans:
Short-term Debt
Basis spread on variable rate (percentage)	1.45%
Maximum | $250 Million Senior Revolving Line Of Credit (Line of Credit) | Line of Credit
Short-term Debt
Basis spread on variable rate (percentage)	2.25%
Maximum | $250 Million Term Loan (First Term Loan) | Term Loans:
Short-term Debt
Basis spread on variable rate (percentage)	2.20%
Maximum | $300 Million Senior Term Loan Agreement (Second Term Loan) | Term Loans:
Short-term Debt
Basis spread on variable rate (percentage)	2.00%
Maximum | $200 Million Senior Term Loan Agreement (Third Term Loan) | Term Loans:
Short-term Debt
Basis spread on variable rate (percentage)	2.20%