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Investments Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 32,245 $ 32,207
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 901 882
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (274) (139)
Available-for-sale securities 32,872 32,950
Convertible debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 9,272 9,234
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 901 882
Available-for-sale securities 10,173 10,116
Redeemable preferred shares [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 22,973 22,973
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax [1] (274) (139)
Available-for-sale securities $ 22,699 $ 22,834
Minimum [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Equity Method Investment, Ownership Percentage 43.00% 43.00%
AFS Debt Security, Ownership Percentage 17.00% 17.00%
Maximum [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Equity Method Investment, Ownership Percentage 45.00% 45.00%
AFS Debt Security, Ownership Percentage 25.00% 25.00%
[1] (1)Available-for-sale securities with an unrealized loss were in a loss position for less than 12 months.