CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Tax benefit (deficiency) on issuance of shares under employee stock purchase plan and option plans and stock-based compensation	$ 327	$ (60)	$ 2,389