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, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 2,048 $ 3,409
Gross unrealized gains in Accumulated OCI 1,308 1,313
Gross unrealized losses in Accumulated OCI (248) (194)
Fair value 3,108 4,528
Common stock investments, available for sale    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,048 3,409
Gross unrealized gains in Accumulated OCI 1,308 1,313
Gross unrealized losses in Accumulated OCI (248) (194)
Fair value $ 3,108 $ 4,528