Derivative Instruments and Hedging Activities - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Accumulated Other Comprehensive Income (Loss) | ||||
| Beginning balance | $ 6,452 | $ 751 | $ 8,126 | $ 1,210 |
| Amount reclassified to income | (963) | 1,305 | (3,081) | 2,684 |
| Net change in unrealized gains or losses | 697 | 13,969 | 1,141 | 12,131 |
| Ending balance | $ 6,186 | $ 16,025 | $ 6,186 | $ 16,025 |
| X | ||||||||||
- Definition Accumulated Other Comprehensive Income [Roll Forward] No definition available.
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| X | ||||||||||
- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). No definition available.
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| X | ||||||||||
- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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