Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Section 13
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Fair Value Measurements And Derivative Instruments (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Sep. 10, 2019	Sep. 03, 2019
Derivatives, Fair Value [Line Items]
Estimated Fair Value		$ 175,000	$ 4,678,000
Balance at December 31, 2019	$ 2,536,000	(3,495,000)	516,000
Unrealized gain (loss) reclassified from accumulated other comprehensive income to interest expense		3,105,000
Loss to be reclassified to interest expense during next 12 months		3,918,000
Estimate of Fair Value Measurement [Member]
Derivatives, Fair Value [Line Items]
Estimated fair value of debt		1,098,082,000	1,082,485,000
Reported Value Measurement [Member]
Derivatives, Fair Value [Line Items]
Estimated fair value of debt		1,128,199,000	1,093,031,000
Interest Rate Swap II [Member] \| Third Term Loan [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		50,000,000
Estimated Fair Value		0	320,000
Interest Rate Swap II [Member] \| Unsecured Debt [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		300,000,000
Estimated Fair Value		0	2,287,000		$ 1,783,000
Interest Rate Swap II [Member] \| Unsecured Credit Facility September 10, 2019 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		300,000,000
Estimated Fair Value		1,776,000	0
Interest Rate Swap [Member] \| Third Term Loan [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		150,000,000
Estimated Fair Value		0	1,741,000
Interest Rate Swap [Member] \| Unsecured Credit Facility September 3, 2019 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		43,900,000
Estimated Fair Value		175,000	0
Interest Rate Swap [Member] \| Unsecured Debt [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		103,500,000
Estimated Fair Value		0	(315,000)		$ 1,783,000
Interest Rate Swap [Member] \| Second Term Loan [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		103,500,000
Estimated Fair Value		0	(314,000)
Interest Rate Swap [Member] \| Unsecured Credit Facility August 10, 2017 [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value				$ 1,379,000
Interest Rate Swap Four [Member] \| Unsecured Credit Facility September 3, 2019 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		103,500,000
Estimated Fair Value		(718,000)	0
Interest Rate Swap Three [Member] \| Unsecured Credit Facility September 3, 2019 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		103,500,000
Estimated Fair Value		$ (718,000)	$ 0