Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Gross long-term debt	$ 253,964
Less: unamortized debt issuance costs	(5,912)	$ (10,240)
Total long-term debt	248,052	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
Less: unamortized debt issuance costs	(5,912)
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 81,464	$ 66,062