Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	1,375,000	875,000
Preferred stock, shares outstanding	1,375,000	875,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	642,517,260	637,151,800
Common stock, shares outstanding	558,526,922	572,675,375
Treasury stock, at cost; shares	83,990,338	64,476,425