FAIR VALUE MEASUREMENTS: (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2015
Assets and liabilities measured at fair value on a nonrecurring basis
Long-lived assets	$ (2,280)	$ (1,909)
Senior Notes \| Senior Term Notes, net
Assets and liabilities measured at fair value on a nonrecurring basis
Debt fair value	126,400		$ 125,900
Debt, gross	123,000		123,000
Unamortized discount	1,627		1,815	$ 3,000
Unamortized debt issuance costs	$ 526		$ 586

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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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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Amount, after accumulated amortization, of debt discount.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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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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