Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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SENIOR UNSECURED NOTES (Details) - USD ($)	Dec. 17, 2014	Sep. 30, 2015	Dec. 31, 2014	Aug. 01, 2014	Sep. 19, 2012
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 7,600,000	$ 9,400,000
Ownership interest (in percent)	100.00%
Unsecured Debt \| Senior Notes Due 2021
Debt Instrument [Line Items]
Debt issued				$ 300,000,000
Stated interest rate on debt instrument (as a percent)				5.875%
Unsecured Debt \| Senior Notes Due, 2017
Debt Instrument [Line Items]
Debt issued	$ 319,555,000				$ 325,000,000
Stated interest rate on debt instrument (as a percent)					7.375%
Senior Notes Due, 2017 \| Unsecured Debt
Debt Instrument [Line Items]
Principal amount retired	5,445,000
Repurchase amount	5,600,000
Loss on extinguishment of debt	$ (200,000)