Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 477,117
Less unamortized debt issuance costs	(5,872)	$ (5,854)
Total long-term debt less unamortized debt issuance costs	$ 471,245	490,145
Term Note Payable Maturing December 2018 [Member]
Debt Instrument [Line Items]
Notes payable maturity date	Dec. 18, 2018
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	$ (5,088)
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	$ 98,011	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	$ 120,525	125,000
Less unamortized debt issuance costs	$ (784)
Notes payable maturity date	Dec. 18, 2018
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Gross long-term debt	$ 108,581	$ 122,988