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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period $ 1,176,339 $ 1,050,557
Other comprehensive income (loss) (1,705) (2,089)
End of the period 1,198,034 1,055,260
Total    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (105,698) (93,455)
End of the period (107,403) $ (95,544)
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (92,148)  
Other comprehensive income (loss) (278)  
End of the period (92,426)  
Defined Benefit Plan    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period (13,932)  
Other comprehensive income (loss) (258)  
End of the period (14,190)  
Deferred Hedging Losses    
Accumulated Other Comprehensive Income (Loss)    
Beginning of the period 382  
Other comprehensive income (loss) (1,169)  
End of the period $ (787)