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Investments Available-for-Sale Investments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 511 $ 23,256
Available-for-sale Securities, Gross Unrealized Gain 132 112
Available-for-sale Securities, Gross Unrealized Loss 0 (698)
Available-for-sale Securities 643 22,670
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 0 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 643 22,670
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 0 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value $ 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   22,047
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   698
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   22,047
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (698)