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Fair Value Measurements Fair Value Measurements (Available-for-sale Securities) (Details) - Level 2 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 830 $ 0
Gross Unrealized Gains 102 0
Gross Unrealized Losses 0 0
Estimated Fair Value $ 932 $ 0