Debt (Summary Of The Balances Outstanding And Interest Rate Spread) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Line of Credit	$ 37,000	$ 10,000
Unsecured Term Loan	698,559	698,202
Deferred Loan Costs	(2,341)	(2,698)
$250 Million Senior Unsecured Revolving Line Of Credit ("Line of Credit") [Member]
Short-term Debt [Line Items]
Line of Credit	37,000	10,000
$250 Million Unsecured Term Loan ("First Term Loan") [Member]
Short-term Debt [Line Items]
Unsecured Term Loan	207,000	207,000
$300 Million Senior Unsecured Term Loan Agreement ("Second Term Loan")[Member]
Short-term Debt [Line Items]
Unsecured Term Loan	300,000	300,000
$200 Million Senior Unsecured Term Loan Agreement ("Third Term Loan")[Member]
Short-term Debt [Line Items]
Unsecured Term Loan	$ 193,900	$ 193,900
Minimum [Member] \| $250 Million Senior Unsecured Revolving Line Of Credit ("Line of Credit") [Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	1.50%
Minimum [Member] \| $250 Million Unsecured Term Loan ("First Term Loan") [Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	1.45%
Minimum [Member] \| $300 Million Senior Unsecured Term Loan Agreement ("Second Term Loan")[Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	1.50%
Minimum [Member] \| $200 Million Senior Unsecured Term Loan Agreement ("Third Term Loan")[Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	1.45%
Maximum [Member] \| $250 Million Senior Unsecured Revolving Line Of Credit ("Line of Credit") [Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	2.25%
Maximum [Member] \| $250 Million Unsecured Term Loan ("First Term Loan") [Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	2.20%
Maximum [Member] \| $300 Million Senior Unsecured Term Loan Agreement ("Second Term Loan")[Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	2.25%
Maximum [Member] \| $200 Million Senior Unsecured Term Loan Agreement ("Third Term Loan")[Member]
Short-term Debt [Line Items]
Basis spread on variable rate (in hundredths)	2.20%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Section S99
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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