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)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Percentage of variable interest rate paid by the counterparty on the notional amount of the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

The amount of gains or losses on a an interest rate swap capitalized in the period to regulatory assets or liabilities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The amount reclassified in the period to interest expense from regulatory assets or liabilities as a result of interest rate swap settlements.

+ References

No definition available.

+ Details

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- Definition

The estimated amount as of the balance sheet date expected to be reclassified to interest expense from regulatory assets or liabilities within the next twelve months as a result of interest rate swap settlements.

+ References

No definition available.

+ Details

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- Definition

Net payment rate on interest rate derivative with the counterparty for the period.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

The potential amount payable to the interest rate swap counter party due to certain violations of the terms and conditions of the swap agreement.

+ References

No definition available.

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- Details

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- Details

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Interest Rate Swap Agreement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Interest Rate Swap Agreement [Abstract]
Long-term debt	$ 87,520		$ 87,520		$ 87,542
Interest Rate Swap [Member]
Interest Rate Swap Agreement [Abstract]
Notional amount of swap	$ 12,000		$ 12,000
Fixed interest rate	3.16%		3.16%
Net payment rate on swaps	2.88%	3.04%	2.84%	3.01%
Interest rate swap settlements reclassified from regulatory assets to interest expense	$ 86	$ 91	$ 173	$ 182
Interest rate swap gain (loss) capitalized	(334)	$ 427	(843)	$ 84
Interest rate swap settlements to be reclassified during the next 12 months	345		345
Potential payment to counterparty	$ 3,378		$ 3,378
LIBOR [Member] \| Interest Rate Swap [Member]
Interest Rate Swap Agreement [Abstract]
Percentage of variable interest rate	59.00%		59.00%
Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member]
Interest Rate Swap Agreement [Abstract]
Long-term debt	$ 12,000		$ 12,000		$ 12,000