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Financial Instruments - Net Unrealized Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale Securities      
Net unrealized gains (losses) on available-for-sale securities, net of tax $ 1,471 $ 214 $ (41)
Available-for-sale securities      
Available-for-sale Securities      
Balance (552) (766)  
Net unrealized gains (losses) on available-for-sale securities, net of tax 1,487 171  
Reclassifications of losses (gains) realized from sale of available-for-sale securities (16) 43  
Increase (decrease) in other comprehensive loss 1,471 214  
Balance $ 919 $ (552) $ (766)