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Debt And Shareholders' Equity (Narrative) (Details) - USD ($)
number in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Debt And Shareholders' Equity [Line Items]          
Schedule of Long-term Debt Instruments [Table Text Block]    
Long-term debt is summarized as follows:
(In thousands)
June 30,
2015
 
December 31, 2014
 
 
 
 
Junior subordinated debentures related to trust preferred securities
$
164,950

 
$
168,043

Convertible subordinated notes
143,964

 
132,838

Subordinated notes
334,888

 
335,798

Senior notes
406,149

 
432,385

FHLB advances
—

 
22,156

Capital lease obligations
987

 
1,062

Total
$
1,050,938

 
$
1,092,282

    
Junior Subordinated Notes $ 164,950 $ 164,950 $ 164,950   $ 168,043
Convertible Subordinated Debt 143,964 143,964 143,964   132,838
Subordinated Debt 334,888 334,888 334,888   335,798
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     8,439 $ 83,190  
Stockholders' Equity [Abstract]          
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     84,430 $ (27,926)  
Subordinated Debt, Current 228,961 228,961 228,961    
Senior Notes 406,149 406,149 406,149   432,385
Federal Home Loan Bank Advances, Redeemed   22,000      
Capital Lease Obligations 987 987 987   1,062
Long-term Debt, Gross 1,050,938 1,050,938 1,050,938   $ 1,092,282
Medium-term Notes $ 11,100 11,100 11,100    
Trust Preferred Securities, Redeemed   3,100      
Convertible Subordinated Note, Coupon Rate 6.00% [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate 0.00%        
Stockholders' Equity [Abstract]          
Convertible Subordinated Debt, Current $ 76,523 $ 76,523 76,523    
Debt Instrument, Maturity Date   Sep. 15, 2015      
Subordinated Notes, Coupon Rate 6.00% [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate 0.00%        
Stockholders' Equity [Abstract]          
Subordinated Debt, Current $ 32,520 $ 32,520 32,520    
Debt Instrument, Maturity Date   Sep. 15, 2015      
Convertible Subordinated Notes, Coupn Rate 5.50% [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate 0.00%        
Stockholders' Equity [Abstract]          
Convertible Subordinated Debt, Current $ 67,441 $ 67,441 67,441    
Debt Instrument, Maturity Date   Nov. 16, 2015      
Subordinated Notes, Coupon Rate 5.50% [Member] [Member]          
Debt And Shareholders' Equity [Line Items]          
Subordinated Borrowing, Interest Rate 0.00%        
Stockholders' Equity [Abstract]          
Subordinated Debt, Current $ 52,477 $ 52,477 52,477    
Debt Instrument, Maturity Date   Nov. 16, 2015      
Senior medium-term notes, optional early redemptions in 2015 [Member]          
Debt And Shareholders' Equity [Line Items]          
Long-term Senior notes redeemed   $ 19,000 $ 27,000