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Marketable Securities (Narratives) (Details) - USD ($)
3 Months Ended
Jun. 30, 2018
Dec. 21, 2017
Jun. 30, 2017
Gain (Loss) on Securities [Line Items]      
Equity Method Investments   $ 3,359,000  
EMC [Member]      
Gain (Loss) on Securities [Line Items]      
Equity Method Investment, Ownership Percentage   49.00%  
Equity Method Investments $ 3,442,000    
Increase (Decrease) in Accounts Receivable, Related Parties 4,830,000    
ASU 2016-01 [Member]      
Gain (Loss) on Securities [Line Items]      
Cumulative Effect of New Accounting Principle in Period of Adoption $ (888,000)   $ 0