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Benefit Plans (Fair value of our pension benefits plan assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Other Investments $ 5,089 $ 5,484 $ 3,959
Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 220,633 201,534  
Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure 0 0  
Other Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Insurance Contract 5,089 5,484  
Cash and Cash Equivalents, Fair Value Disclosure 450 67  
Other Investments 14,720 15,228  
Equity Securities, FV-NI 73,532 74,081  
Defined Benefit Plan, Plan Assets, Amount 117,504 119,441 $ 101,663
Debt Securities, Trading 23,713 24,581  
Other Defined Benefit Pension Plans [Member] | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Insurance Contract 0 0  
Cash and Cash Equivalents, Fair Value Disclosure 450 67  
Other Investments 0 0  
Defined Benefit Plan, Plan Assets, Amount 450 67  
Other Defined Benefit Pension Plans [Member] | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Insurance Contract 0 0  
Cash and Cash Equivalents, Fair Value Disclosure 0 0  
Other Investments 14,720 15,228  
Defined Benefit Plan, Plan Assets, Amount 14,720 15,228  
Other Defined Benefit Pension Plans [Member] | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Insurance Contract 5,089 5,484  
Cash and Cash Equivalents, Fair Value Disclosure 0 0  
Other Investments 0 0  
Defined Benefit Plan, Plan Assets, Amount $ 5,089 $ 5,484