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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period $ 1,050,557 $ 856,111
Other comprehensive income (loss) (2,089) (1,322)
End of the period 1,055,260 950,338
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (83,848)  
Other comprehensive income (loss) (4,963)  
End of the period (88,811)  
Defined Benefit Plan    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (6,398)  
Other comprehensive income (loss) (164)  
End of the period (6,562)  
Deferred Hedging Losses    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (3,209)  
Other comprehensive income (loss) 3,038  
End of the period (171)  
Total    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (93,455) (100,706)
Other comprehensive income (loss) (2,089)  
End of the period $ (95,544) $ (102,028)