Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 18, 2015	Mar. 09, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 229,598
Less unamortized debt issuance costs	(4,605)	$ (5,065)
Total long-term debt	224,993	305,513
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member]
Debt Instrument [Line Items]
Gross long-term debt	150,000	150,000		$ 150,000
Less unamortized debt issuance costs	$ (4,605)
Notes payable maturity date	Jun. 15, 2045
Term Note [Member] | Term Note Payable, Maturing December 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt		89,200	$ 125,000
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 79,598	$ 71,378