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Other Income (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income (Expense), Excluding Foreign Currenty Transaction Adjustments       $ 162,000 $ 417,000  
Gain (Loss) on Disposition of Business     $ (800,000)   (940,000)  
Gain on Sale of Investments       2,083,000 1,932,000  
Realized Investment Gains (Losses)       833,000 (995,000)  
Other income, net       1,346,000 414,000 $ 7,238,000
Foreign Currency Transaction Gain (Loss), before Tax $ 659 $ 10,081   18,137,000 (213,000) $ (39,328,000)
Other Nonoperating Income       19,483,000 $ 201,000  
Aggregate 2017 Dispositions [Domain]            
Gain (Loss) on Disposition of Business       $ (1,732,000)