General and Summary of Significant Accounting Policies Investments (Details) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Debt Securities, Available-for-sale [Line Items] | ||
Available-for-sale Equity Securities, Amortized Cost Basis | $ 27,661 | |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 0 | |
Available-for-sale Securities | 27,661 | |
Short-term Investments [Member] | ||
Debt Securities, Available-for-sale [Line Items] | ||
Available-for-sale Equity Securities, Amortized Cost Basis | 14,687 | $ 23,967 |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 0 | 0 |
Available-for-sale Securities | 14,687 | $ 23,967 |
Long-term Investments [Domain] | ||
Debt Securities, Available-for-sale [Line Items] | ||
Available-for-sale Equity Securities, Amortized Cost Basis | 12,974 | |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | 0 | |
Available-for-sale Securities | $ 12,974 |