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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Treasury Stock - Common [Member]      
Purchase of shares for company benefit plans, shares 37,871 54,493 34,678
Release of shares from company benefit plans, shares 255,091 231,081 422,395
Preferred Stock, Exchanged for Shares of Common Stock [Member] | Preferred Stock [Member]      
Conversion of Stock, Shares Converted 1,412,009 0 0
Preferred Stock, Exchanged for Shares of Common Stock [Member] | Additional Paid-in Capital [Member]      
Stock Issued During Period, Shares, Conversion of Convertible Securities 120,186,195 0 0
Contingent Convertible Senior Notes Exchanged for Shares of Common Stock [Member] | Additional Paid-in Capital [Member]      
Stock Issued During Period, Shares, Conversion of Convertible Securities 55,427,782 0 0
Senior Notes Exchanged for Shares of Common Stock [Member] | Additional Paid-in Capital [Member]      
Stock Issued During Period, Shares, Conversion of Convertible Securities 53,923,925 0 0