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Shareholders' Equity (Share Repurchases, Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options
Dec. 31, 2012
Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options
Dec. 31, 2011
Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options
May 13, 2010
Share Repurchase Program Authorized in 2010
Apr. 30, 2012
Share Repurchase Program Authorized in 2010
Jan. 31, 2011
Share Repurchase Program Authorized in 2010
Jan. 31, 2013
Share Repurchase Program Authorized in 2010
Repurchase of Equity
Equity, Class of Treasury Stock [Line Items]                    
Repurchase of common shares, shares       1,008,105 1,268,809 743,073        
Repurchase of common shares, value $ 4,800,908 $ 8,086,594 $ 4,247,440 $ 4,800,000 $ 8,100,000 $ 4,200,000        
Share repurchase program, number of shares authorized to be repurchased             10,000,000      
Share repurchase program, additional authorized amount replacing prior authorizations               $ 10,000,000 $ 10,000,000 $ 10,000,000