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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net income (loss) $ (8,359) $ (9,592) $ 82,882 $ 61,912
Other comprehensive income:        
Unrealized gain on pension plan obligation [1] 556 528 1,670 1,584
Tax effect of unrealized gain on pension plan (230) (217) (689) (649)
Total other comprehensive income 326 311 981 935
Total comprehensive income (loss) $ (8,033) $ (9,281) $ 83,863 $ 62,847
[1] These items are included in the computation of net periodic pension cost.