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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Treasury Stock - Common [Member]    
Purchase of shares for company benefit plans, shares 33,955 37,687
Release of shares from company benefit plans, shares 182,092 81,104
Preferred Stock, Exchanged for Shares of Common Stock [Member]    
Stock Issued During Period, Shares, Conversion of Convertible Securities 1,021,000 0
Preferred Stock, Exchanged for Shares of Common Stock [Member] | Preferred Stock [Member]    
Conversion of Stock, Shares Converted 25,802 0
Preferred Stock, Exchanged for Shares of Common Stock [Member] | Additional Paid-in Capital [Member]    
Stock Issued During Period, Shares, Conversion of Convertible Securities 1,021,506 0
Contingent Convertible Senior Notes Exchanged for Shares of Common Stock [Member]    
Stock Issued During Period, Shares, Conversion of Convertible Securities 55,428,000 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
Senior Notes Exchanged for Shares of Common Stock [Member]    
Stock Issued During Period, Shares, Conversion of Convertible Securities 53,924,000 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