Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Accumulated Other Comprehensive Income (Details)

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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
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