Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Shareholders' Equity Consolidated Statements of Shareholders' Equity (Parenthetical)

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Consolidated Statements of Shareholders' Equity Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Dividends per share (in dollars per share) $ 0.48us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.34us-gaap_CommonStockDividendsPerShareDeclared