Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Schedule of Dividends Declared (Details)

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Stockholders' Equity Schedule of Dividends Declared (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dividends Payable [Line Items]                              
Dividends Payable, Date Declared Dec. 17, 2013 Sep. 11, 2013 Jun. 18, 2013 Mar. 18, 2013 Dec. 17, 2012 Sep. 12, 2012 Jun. 12, 2012 Mar. 14, 2012 Dec. 14, 2011 Sep. 14, 2011 Jun. 14, 2011 Mar. 02, 2011      
Dividends Payable, Date of Record Dec. 27, 2013 Sep. 26, 2013 Jun. 28, 2013 Apr. 02, 2013 Dec. 31, 2012 Sep. 24, 2012 Jun. 22, 2012 Mar. 26, 2012 Dec. 27, 2011 Sep. 26, 2011 Jun. 24, 2011 Mar. 14, 2011      
Dividends Payable, Date to be Paid Dec. 31, 2013 Oct. 23, 2013 Jul. 23, 2013 Apr. 24, 2013 Jan. 18, 2013 Oct. 22, 2012 Jul. 20, 2012 Apr. 20, 2012 Jan. 20, 2012 Oct. 20, 2011 Jul. 20, 2011 Apr. 14, 2011      
Common Stock, Dividends, Per Share, Declared $ 0.26 $ 0.28 $ 0.31 $ 0.32 $ 0.55 $ 0.36 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 0.40 $ 1.17 $ 1.71 $ 1.60