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Fair Value Measurements (Details 2) - Common Stock - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost $ 4,195 $ 4,195
Gross Unrealized Gains   16,321
Gross Unrealized Losses   0
Fair Value   $ 20,516