Investments (Maturity Distribution) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Amortized Cost
Due in one year or less	$ 26,328
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	110,907
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	215,708
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	972,774
Debt Securities, Available-for-sale, Amortized Cost	1,325,717	$ 1,321,487
Debt Securities, Available-for-sale, Fair Value
Due in one year or less	26,803
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	120,971
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	236,746
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	1,083,247
Debt Securities, Available-for-sale	$ 1,467,767	$ 1,489,383

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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