Quarterly report pursuant to Section 13 or 15(d)

Short Term Borrowings and Credit Lines (Details)

v3.19.1
Short Term Borrowings and Credit Lines (Details)
Apr. 17, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Debt Instrument [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity | $ $ 50,000,000 $ 100,000,000  
Unsecured And Uncommitted Credit Line1 [Member] | European Subsidiary [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity | €     € 25,800,000
Unsecured And Uncommitted Credit Line2 [Member] | European Subsidiary [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity | €     € 5,000,000
Unsecured And Uncommitted Line Of Credit [Member] | European Subsidiary [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity | $   $ 35,000,000