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STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Issuance of treasury shares under stock purchase plans, ordinary shares 3,143,469 2,735,516 3,382,608
Issuance of treasury shares under stock purchase plans, ordinary shares withheld for taxes 34,660 33,748 42,623
Treasury shares 12,032,899 11,207,320 10,148,834