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FINANCING ARRANGEMENTS: Additional Information (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 121,096,000 | $ 120,599,000 |
Senior Notes | Senior Term Notes 5.75% |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount |  |  | $ 120,000,000
Interest rate percentage |  |  | 5.75%
Senior Notes | Senior Term Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount |  |  | $ 123,000,000.0
Interest rate percentage | 5.50% |  | 5.50%
Unamortized discount | $ 1,439,000 | 1,815,000 | $ 3,000,000
Long-term debt | 121,096,000 | 120,599,000 |
Line of Credit | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 200,000,000 |  |
Debt term | 5 years |  |
Long-term debt | $ 0 | 0 |
Outstanding standby letters of credit | 1,500,000 | 1,500,000 |
Revolving credit facility remaining borrowing capacity | $ 198,500,000 | $ 198,500,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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