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Accumulated Other Comprehensive Loss (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss $ 858,547 $ 822,549
Reclassification from accumulated other comprehensive loss into earnings 0 0
Cumulative translation adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss (24,981) (26,100)
Unrecognized net loss on pension plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss (251) (252)
Accumulated other comprehensive loss, net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Components of Accumulated Other Comprehensive Loss $ (25,232) $ (26,352)