Stockholders Equity (Details Textuals) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended
	Sep. 14, 2011	Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2008	Jul. 23, 2013	Dec. 06, 2011
Stockholders' Equity Note [Abstract]
Preferred Stock, Dividend Payment Terms	September 15, 2016
Depositary Shares Issued	2,600,000
Rate On Depositary Shares Issued	8.00%
Liquidation Preference On Depositary Shares	$ 1,000
Depositary Share Per Share Value			$ 25
Depositary Shares Issued As Interest In Eight Percent Perpetual Preferred Stock	On September 14, 2011, the Corporation issued 2,600,000 depositary shares, each representing a 1/40th interest in a share of the Corporation’s 8.00% Perpetual Preferred Stock, Series B, liquidation preference $1,000 per share (the “Series B Preferred Stock”).
Stock Repurchased During Period, Value		$ 2,451,000	$ 1,626,000
Subsidiary Equity Balance		3,100,000,000
Class of Stock [Line Items]
Common shares, par value		$ 0.01	$ 0.01
Preferred Equity
Class of Stock [Line Items]
Stock Repurchase Program Authorized Amount					10,000,000
Treasury Stock Shares Acquired		88,000	58,000
Common Stock
Class of Stock [Line Items]
Stock Repurchase Program Authorized Amount		360,000,000
Treasury Stock Shares Acquired		14,300,000	7,700,000
Treasury Stock Carrying Basis		259,000,000	120,000,000
Remaining Authorized Repurchase Amount		76,000,000
Treasury Stock Shares Retired		8,500,000
Treasury Stock Acquired Average Cost Per Share		$ 18.12	$ 15.57
Warrants to Purchase shares of common stock				4,000,000
Common shares, par value						$ 0.01
Exercise price of warrants				$ 19.77
Repurchased shares for minimum tax withholding settlements		225,000	239,000
Repurchased amount for minimum tax withholding settlement		$ 4,000,000	$ 3,000,000
Minimum Tax Withholding Settlement Average Cost Per Share		$ 16.50	$ 14.00