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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Net income $ (2,807) $ 10,448 $ 11,193 $ 24,742
Other comprehensive income (loss):        
Actuarial gains (losses) and other changes in unrecognized costs (88) 516 (338) 631
Amortization of unrecognized costs 1,370 1,427 2,736 2,867
Change in unrealized gains (losses) (2,351) 493 (1,577) 554
Foreign currency translation gains (losses) (956) (10,441) 2,455 (11,607)
Other comprehensive income (loss) before tax (1,112) (7,922) 4,340 (7,251)
Actuarial gains (losses) and other changes in unrecognized costs 425 (224) 477 (134)
Amortization of unrecognized costs (327) (502) (805) (1,008)
Change in unrealized gains and (losses) 5 (188) (104) (211)
Income tax provision (benefit) to other comprehensive income (loss) 95 (946) (476) (1,469)
Other comprehensive gain (loss), net of tax (1,017) (8,868) 3,864 (8,720)
Comprehensive income (loss) (3,824) 1,580 15,057 16,022
Interest Expense [Member]        
Other comprehensive income (loss):        
Amortization of unrealized gains and (losses) 913 83 1,064 304
Amortization of unrealized gains and (losses) $ (8) $ (32) $ (44) $ (116)