Long-Term Debt (Long-Term Debt with Related Unamortized Debt Issuance Cost) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal	$ 396,209
Unamortized Debt Issuance Costs	10,322	$ 4,428
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Principal	150,000	150,000
Unamortized Debt Issuance Costs	4,296
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2060 [Member]
Debt Instrument [Line Items]
Principal	172,500
Unamortized Debt Issuance Costs	6,026
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Principal	$ 73,709	$ 87,890