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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Net income $ 7,645 $ 11,516 $ 31,810 $ 39,868
Other comprehensive income (loss):        
Actuarial gains (losses) and other changes in unrecognized costs (128) 94 503 651
Amortization of unrecognized costs 1,427 1,188 4,294 3,590
Change in unrealized gains and (losses) (3,445) (963) (2,891) (1,007)
Foreign currency translation gains (losses) 4,498 5,159 (7,109) (5,760)
Other comprehensive income (loss) before tax 2,432 5,725 (4,819) (2,052)
Income tax provision (benefit):        
Actuarial gains (losses) and other changes in unrecognized costs 29 (4) (105) (119)
Amortization of unrecognized costs (503) (420) (1,511) (1,265)
Change in unrealized gains and (losses) 1,311 368 1,100 384
Income tax provision (benefit) to other comprehensive income (loss) 807 (151) (662) (1,181)
Other comprehensive income (loss), net of tax 3,239 5,574 (5,481) (3,233)
Comprehensive income 10,884 17,090 26,329 36,635
Interest Expense [Member]        
Other comprehensive income (loss):        
Amortization of unrealized gains and (losses) 80 247 384 474
Income tax provision (benefit):        
Amortization of unrealized gains and (losses) $ (30) $ (95) $ (146) $ (181)