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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
Mar. 05, 2013
Mar. 31, 2013
Feb. 12, 2013
Common stock, dividends declared $ 0.05    
Series B [Member]
      
Public offering, shares     2,000,000
Dividend rate percentage   7.25%  
Public offering, per share     $ 24.58
Public offering, realized net proceeds, net offering expenses     $ 47.6
Additional shares issued to underwriters     300,000
Net proceeds realized from issuance of additional shares to underwriters     7.1
ATM equity program, shares issued   221,000  
ATM equity program, weighted average price per share   $ 24.52  
ATM equity program, realized net proceeds, net offering expenses   5.2  
Preferred stock, dividends declared $ 0.453125    
Series A [Member]
      
Dividend rate percentage   8.875%  
Shares of Redeemable Preferred Stock redeemed and purchased   1,408,000  
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased   $ 35.4