Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Gross long-term debt	$ 396,286
Less: unamortized debt issuance costs	(10,017)	$ (4,428)
Total long-term debt	386,269	233,462
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Gross long-term debt	150,000	150,000
Less: unamortized debt issuance costs	(4,340)
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2060 [Member]
Debt Instrument [Line Items]
Gross long-term debt	172,500
Less: unamortized debt issuance costs	(5,677)
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 73,786	$ 87,890