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Investments Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 2,500  
Available-for-sale Securities, Amortized Cost Basis 28,190 $ 26,828
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,078 1,691
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (2,477) (1,037)
Available-for-sale securities 26,791 27,482
Convertible debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 9,815 8,453
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,078 1,691
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (25) (106)
Available-for-sale securities 10,868 10,038
Redeemable preferred shares [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 18,375 18,375
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax [1] (2,452) (931)
Available-for-sale securities $ 15,923 $ 17,444
Minimum [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Equity Method Investment, Ownership Percentage 10.00% 41.00%
AFS Debt Security, Ownership Percentage 19.00% 19.00%
Maximum [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Equity Method Investment, Ownership Percentage 36.00%  
AFS Debt Security, Ownership Percentage 25.00% 25.00%
[1] (1)As of June 30, 2017, one security in an unrealized loss position of $2.5 million has been in an unrealized loss position for greater than 12 months.