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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period $ 856,111 $ 759,948
Other comprehensive income (loss) (1,322) 2,152
End of the period 950,338 758,920
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (89,708)  
Other comprehensive income (loss) 1,456  
End of the period (88,252)  
Defined Benefit Plan    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (10,480)  
Other comprehensive income (loss) (102)  
End of the period (10,582)  
Deferred Hedging Losses    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (518)  
Other comprehensive income (loss) (2,676)  
End of the period (3,194)  
Total    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (100,706) (111,985)
Other comprehensive income (loss) (1,322)  
End of the period $ (102,028) $ (109,833)