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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Net income $ 13,998 $ 14,294
Other comprehensive income (loss):    
Actuarial gains (losses) and other changes in unrecognized costs (250) 115
Amortization of unrecognized costs 1,365 1,440
Change in unrealized gains and (losses) 774 61
Foreign currency translation gains (losses) 3,414 (1,166)
Other comprehensive income (loss) before tax 5,454 671
Actuarial gains (losses) and other changes in unrecognized costs 52 90
Amortization of unrecognized costs (478) (506)
Change in unrealized gains and (losses) (109) (23)
Income tax provision (benefit) to other comprehensive income (loss) (571) (523)
Other comprehensive income (loss), net of tax 4,883 148
Comprehensive income (loss) 18,881 14,442
Interest Expense [Member]    
Other comprehensive income (loss):    
Amortization of unrealized gains and (losses) 151 221
Amortization of unrealized gains and (losses) $ (36) $ (84)