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Financial Instruments - Financial Instruments Designated as Available-for-Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [abstract]    
Unrealized net gains on available for sale securities $ 810 $ 912
Reclassification adjustment for realized losses (gains) on equity securities to earnings 361 (20)
Unrealized ains (losses) on available-for-sale investments recognized in OCI $ 1,171 $ 892