Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Jun. 09, 2020
Debt Instrument [Line Items]
Gross long-term debt	$ 253,885
Less: unamortized debt issuance costs	(5,874)	$ (10,240)
Total long-term debt	248,011	378,322
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Gross long-term debt		150,000
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2060 [Member]
Debt Instrument [Line Items]
Gross long-term debt	172,500	172,500	$ 172,500
Less: unamortized debt issuance costs	(5,874)
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 81,385	$ 66,062