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Debt Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Debt Instrument [Line Items] |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | $ 192 | $ 355 |
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured Loan, Unused Borrowing Capacity | $ 5,000 |  |
Unsecured Loan, Maturity Date | Apr. 30, 2019 |  |
Unsecured Loan, Amount Outstanding | $ 0 |  | $ 0
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving Credit Facility, Current Borrowing Capacity | 300,000 |  |
Revolving Credit Facility, Maximum Borrowing Capacity | $ 600,000 |  |
Revolving Credit Facility, Expiration Date | Feb. 20, 2020 |  |
Long-term Debt | $ 0 |  | $ 0
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread on Variable Rate | 0.50% |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread on Variable Rate | 1.00% |  |
Prime Rate [Member] | Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread on Variable Rate | (1.00%) |  |

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- Definition 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. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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