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Common Stock and Dividends (Details) - USD ($)
 6 Months Ended
Oct. 15, 2015
Apr. 17, 2015
Apr. 09, 2015
Apr. 18, 2014
Jun. 30, 2015
Jul. 31, 2015
Common Stock and Dividends            
Series A cumulative perpetual preferred shares, outstanding         216,000  
Warrants to purchase entity's common stock (in shares)         1,326,238  
Warrants, exercise price (in dollars per share)         $ 24.43  
Percentage of aggregate common stock investment on exercise of warrant to Senior Preferred Stock investment         15.00%  
Warrants, term         10 years  
Cash dividends (as a percent)         33.00%  
Cash dividends paid to common shareholders (in dollars per share) $ 0.27 $ 0.29   $ 0.25    
Repurchase of common stock, authorized amount     $ 40,000,000   $ 40,000,000  
Period of repurchase of common stock     12 months   12 months  
Cumulative number of shares repurchased under all stock repurchase programs           8,685,700
Cumulative cost of shares repurchased under all stock repurchase programs           $ 257,731,000