v2.4.1.9
Consolidated Statements of Changes in Common Shareholders' Equity (Parentheticals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash dividends [Abstract]      
Cash dividends declared per share $ 1.91us-gaap_CommonStockDividendsPerShareDeclared $ 1.48us-gaap_CommonStockDividendsPerShareDeclared $ 1.245us-gaap_CommonStockDividendsPerShareDeclared