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Compensation Programs (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share Based Compensation Programs [Line Items]      
Total grants 0 0 30,000
Expiration date of grant July 1, 2014    
Common shares for future issuance 1,047,951    
Percentage of investment capital, maximum 10.00%    
Common stock dividend payable $ 38,184,000 $ 27,401,000  
Strike price     $ 11.69
Grant date fair value per share     $ 1.52
Volatility factors for years     51.00%
Dividend yields for years     14.00%
Risk-free rates for years     1.70%
Salaries and benefits 6,701,000 6,097,000 5,655,000
Other Benefit Programs [Member]
     
Share Based Compensation Programs [Line Items]      
Compensation plan of voluntary contribution 50.00%    
Compensation plan of voluntary contribution, maximum 6.00%    
Compensation plan of voluntary contribution, additional 3.00%    
Salaries and benefits 514,000 476,000 411,000
Annual Incentive Compensation [Member]
     
Share Based Compensation Programs [Line Items]      
Expenses related to compensation 5,700,000 5,100,000 4,800,000
Percentage of investment capital, maximum 10.00% 8.00% 8.00%
Performance threshold multiplier, basis points 50    
Number of years for average long-term investment capital 10    
Spread over 10-year U.S. Treasury rate (basis points) 200    
Annual Incentive Compensation [Member] | Executive Officer [Member]
     
Share Based Compensation Programs [Line Items]      
Incentive compensation of fully vested stock awards to executive officers 189,283 164,829  
Incentive compensation of fully vested stock awards to executive officers, per share value $ 12.60 $ 12.71  
Long-Term Equity-Based Awards [Member]
     
Share Based Compensation Programs [Line Items]      
Percentage of investment capital, maximum 8.00%    
Number of years for average long-term investment capital 10    
Spread over 10-year U.S. Treasury rate (basis points) 200    
Share awards vesting period (in years) three    
Performance-Based Stock Awards Vesting In Three Year [Member]
     
Share Based Compensation Programs [Line Items]      
Percentage of performance-based awards granted 50.00%    
Performance-Based Stock Awards Vesting After Three Year [Member]
     
Share Based Compensation Programs [Line Items]      
Percentage of performance-based awards granted 50.00%    
Share awards vesting period, maximum (in years) three    
Share awards vesting period, minimum (in years) one    
Stock Awards Activity [Member]
     
Share Based Compensation Programs [Line Items]      
Common stock dividend payable 333,000    
Weighted average remaining contractual term, years 1.9    
Total of unrecognized compensation costs for unvested option awards 4,800,000    
Salaries and benefits 1,600,000 1,400,000 1,000,000
Other general and administrative expense 261,000 119,000 98,000
Option Awards [Member]
     
Share Based Compensation Programs [Line Items]      
Share awards vesting period (in years) ten    
Weighted average remaining contractual term, years 5.40    
Exercisable option awards exercised to date 256,250    
Weighted average exercise price $ 10.71    
Aggregate intrinsic value of stock options 476,000    
Intrinsic value of stock options exercised 129,000 3,000 1,400,000
Salaries and benefits 3,000 16,000 16,000
Other general and administrative expense   $ 15,000 $ 44,000
2008 [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 225,000    
2008 [Member] | Performance-Based Stock Awards [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 140,658 [1]    
Expiration date of grant 2015    
2009 [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 225,000    
2009 [Member] | Performance-Based Stock Awards [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 110,917    
Expiration date of grant 2016    
2010 [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 60,000    
2010 [Member] | Performance-Based Stock Awards [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 128,766    
Expiration date of grant 2017    
2011 [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 72,000    
2011 [Member] | Performance-Based Stock Awards [Member]
     
Share Based Compensation Programs [Line Items]      
Total grants 132,490    
Expiration date of grant 2018    
[1] The performance criteria for the first three-year measurement period ending December 31, 2011 was met resulting in the vesting of the first 50% of this grant.