Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 18, 2015	Mar. 09, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 441,807
Less unamortized debt issuance costs	(5,527)	$ (5,854)
Total long-term debt less unamortized debt issuance costs	436,280	490,145
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	$ (4,956)
Notes payable maturity date	Jun. 15, 2045
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing April 2017 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 95,511	98,011
Notes payable maturity date	Apr. 01, 2017
Term Note [Member] | Term Note Payable, Maturing December 2018 [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 107,100	125,000	$ 125,000
Less unamortized debt issuance costs	$ (571)
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 89,196	$ 122,988