Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary Of Investments (Details)

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Fair Value Measurements - Summary Of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 4,194 $ 2,978
Gross unrealized gains in Accumulated OCI 1,573 904
Gross unrealized losses in Accumulated OCI   (267)
Fair value 5,767 3,615
Common stock investments, available for sale    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,194 2,978
Gross unrealized gains in Accumulated OCI 1,573 904
Gross unrealized losses in Accumulated OCI 0 (267)
Fair value $ 5,767 $ 3,615