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Significant Accounting Policies (Investment in Marketable Securities)(Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Investment in Marketable Securities      
Marketable securities $ 85,110   $ 45,138
Cost basis 36,000   38,700
Proceeds from sale of marketable securities 7,000    
Realized gain (loss) on investment in marketable securities 100    
Fair Value      
Investment in Marketable Securities      
Marketable securities 85,110   45,138
Equity marketable securities      
Investment in Marketable Securities      
Marketable securities   $ 48,315 4,704
Cost basis $ 43,300   4,300
Mortgage-backed securities      
Investment in Marketable Securities      
Marketable securities   $ 36,795 $ 40,434